Tuesday, March 31, 2020
Understanding How a Solution in Chemistry Works
Understanding How a Solution in Chemistry WorksChemistry is a very important science and understanding how it works can help you learn how to make a solution in chemistry. Learning how to make a solution in chemistry means that you have knowledge of the basic steps in a chemical reaction. If you want to learn how to solve problems like these for yourself, read on.The reaction that most people have in mind when they think about a solution in chemistry is an alcohol and water reaction. For example, the answer to the question, 'What happens if you put water and alcohol together?' is that the substance will turn into ethanol, which is used as fuel or as a cleaning solvent. It will also transform back into water. That's a small but important example of a small but important solution in chemistry.There are many different solutions in chemistry that involve more than one substance, though. A simple example is using soap and water to make an oil-water mixture. Or you can use the same solutio n to make salt and alcohol, or a variety of other substances. In fact, sometimes all you need is a couple of different substances to create a solution in chemistry.Another example of a solution in chemistry involves dyes and bleaches. In the example, you have two substances that you need to get out of your skin, so you mix them up. The next step is to go through a chemical reaction in order to take the dye and bleaches out of your skin. So, you will have a solution in chemistry that has the two substances in it, as well as the chemical reaction that takes them out.A solution in chemistry can also be composed of many different kinds of substances. An example is looking at a room of rooms and seeing which room has the highest level of humidity. This can be done by identifying the rooms that are in direct contact withone another, and then comparing their moisture levels.A similar scenario works for the area around you. Looking at a room of rooms can give you a good idea of what's going on in another room of rooms, without having to do a chemical reaction. After all, you can't get everything out of the other room of rooms. But, you can find out a lot about it by looking at how much each room of rooms is going to sweat.There are also a number of chemical reactions that work in a similar way. You can look at a piece of paper and see the structure of the cells that make up the paper. You can then do a chemical reaction and get the word out about it. If you know how to draw pictures of the cells, you can do a chemical reaction to show just how important it is to keep your paper cells healthy.All of these examples of a solution in chemistry are examples of what you need to do to prove something to yourself. You may need to look at a cell or a substance and get a detailed idea of it. Or, you might just need to know enough about it to be able to explain it to someone else. The examples I've given are only a few of the ways that you can use a simple solution in chemistry.
Friday, March 6, 2020
General Chemistry College Textbook
General Chemistry College TextbookThe days of the general college chemistry textbook are long gone. Students must be more cautious about buying textbooks for their chemistry courses, as the need to find a good book is required as an alternative of a classroom lecture.In recent years, large sales have been made to schools and colleges to attract more students into science. The main reason is that the growth in computer technology has added to the demand for information technology products, with the result that many industries are looking to fill their requirements by enrolling students from different parts of the world.The student must select a college chemistry textbook with care to find out what he or she needs. It is important to determine the scope of the study, the type of textbook, the overall cost and the size of the class before going for a purchase. The type of education required in most undergraduate chemistry courses may vary.If the student wants to go into the regular cour se, a textbook for one semester can be bought at $300 or so. However, if the student requires a more advanced course, even buying a semester course book would be a problem.The student should select a book based on his budget and what he expects from the book. One option is to look for books on the Internet. However, online sales are subject to some form of fraud and fake books can be bought.There are many ways of choosing a chemistry course book. Students may need a general chemistry book or they may also look for a chemistry course book for a specific subject.A general college chemistry textbook will give the student a general overview of the subject, but it is the combination of reading the book and doing chemistry experiments to further understand the subject matter that will help him pursue a degree in the field. Thisis not to say that all students who want to pursue a degree in chemistry would require a book, but it can be used as a guideline.
Information About Chemistry Tutoring at University of Michigan
Information About Chemistry Tutoring at University of MichiganThere are many different types of chemistry tutoring available at University of Michigan. Most universities now offer a wide range of options to help in the study of chemistry, as well as other subjects. These include free, paid and volunteer opportunities.Free Tutoring. If you are unable to afford tuition fees at the university of Michigan, you can learn about the subject through online tutoring. This includes classroom sessions, tutoring sessions and discussions with professors.Paid Tutoring. This is where students pay for their tuition fees and get professional assistance when they need it. The tutor can advise students in different subjects about the theory of the subject and can also guide them in the application of the theories.Volunteer Tutoring. This includes the opportunity to work with chemistry labs, or in labs where chemistry is taught.There are also other types of chemistry tutoring which will be considered on a case by case basis. There are tutors who provide lessons on various subjects such as physics, biology, math, engineering and many more.The benefit of online tutoring is that you can choose the time you wish to learn and the method you wish to learn. Also, with online tutoring you do not have to attend lectures and seminars on a regular basis.Chemical and physical sciences are extremely important in this age. Chemistry is one of the most important of these subjects, because it deals with the properties of matter and how they affect the world around us. You can see many different things with this subject, including the nature of atoms, gases, molecules and their properties.
Thursday, March 5, 2020
The Growing List of People to Follow in the Graduate Programs at Purdue University
The Growing List of People to Follow in the Graduate Programs at Purdue UniversityThe Purdue Chemistry Faculty has expanded, expanding on the work of some of the best minds in the field of learning and research. The Department of Organic Chemistry at the College of Agriculture & Life Sciences at the University of Georgia is really growing, as professors are adding many more courses and areas of concentration. The courses that have been added are not just the usual college level classes that people get into, but will help students prepare for professional and career careers, and that should not be overlooked, as that is the real future of this great college.Many of the course offerings for the Organic Chemistry Department have been extensions of the research done by the faculty at Georgia Tech. You might have seen the Global Change course on CNN, about some new discovery from Harvard University. These are just a few examples of the course offerings that have been made available, a nd you can see the possibilities that come with adding many more disciplines to the Organic Chemistry Department.One of the newest additions to the course offerings has been the commitment to practical applications of the newest technology, in organic chemistry. Organic processes such as polymer chemistry, or the handling of organics, is becoming more important, as we learn more about the future of global warming, and pollution, and waste, and everything else that could be created. So it is necessary to understand how the applications of these types of science and technology will affect our world. When you add these types of experiences, the students will be better prepared for the future and will learn some of the tricks that make them truly great scientists, and they will take better care of the environment, all while gaining new understanding.The newest additions to the Purdue Chemistry Faculty, will not only allow these students to learn more about the latest trends in the lab, but they will be learning about some of the same things, at the graduate level, and beyond. With the addition of technology to the mix, there will be plenty of choices for students that will grow to be great scientists, as well as those that will take an interest in helping the Earth, and all of the people that are living on it. This means that the departments within the faculty are expanding and expanding the knowledge, and it is important that all of the information is in as many hands as possible.The Purdue University Chemists is expanding and will continue to expand, as the Department is so close to many of the Research Centers at Purdue. Many of the professionals that the professors have will be seeking employment, or else they will be working for the university, as they work with students to make sure that the courses are going to be teaching, and also as a part of the bigger picture. They also want to make sure that the students are getting an education, and that they are get ting the education they need, in order to be successful in the future.One of the greatest goals of the Chemistry Department at Purdue, is to make sure that every student gets the best possible education possible, when they leave, whether they are going to be entering the industry, or maybe not. The staff at the University is working hard, and with the newest additions, they are making sure that every single student has a chance to become a great scientist, and a great citizen. This is the future of organic chemistry, and this is what the faculty is working towards.One of the great things about the Chemist at Purdue is that they love what they do and will continue to do it for many years to come. They will help everyone from students, to government, to the student body of Purdue University, and they will always push the boundaries of the field, so that you, the person, that are going to have the most to gain from their life, and the life of everyone that they touch. I wish them luck, and I hope that you will join them in their quest.
How to Become a Singer 5 Qualities You Need to Succeed
How to Become a Singer 5 Qualities You Need to Succeed Sign up successful Singing is a performing art. A good singer is both a good musician (sounds good and sings the right notes) and a good performer (is engaging and interesting to watch). There is, in fact, a relationship between performing well and singing well; these skills rely on each other. Is there a secret formula to becoming an outstanding singer? No, but cultivating these five skills hones both musical and performance abilities. Practice these, and you will be able to sing accurately and put on a good show. A Good Ear First of all, a singer needs to sing in tune! For those who are not born with sensitive aural skills (also known as a musical ear), learning to consistently match pitch is an important first step to singing. Working with a voice teacher on aural skills exercises, and practicing those exercises at home, helps. Technology, such as pitch-recognition apps, aid in at-home practice for students who arent yet sure if they are singing the right pitches. Strong Breath Support The more breath support you have, the longer you will be able to sing phrases and the easier it will be for you. Developing a strong base of breath support by learning about the breathing apparatuses of the body and doing breath-related exercises allows you to sing those newly in-tune songs with ease and grace. A Relaxed Body Have you ever watched someone with a stiff body (shoulders up, neck tense) try to perform? Itâs extremely stressful for the audience, not just the performer. Learning to relax your body â" especially the parts directly involved with singing, such as your jaw, tongue, and neck â" in performance situations is an essential skill for singers. Practice singing in front of a mirror, noticing what happens. When you hit a high note, do you strain your shoulders and neck? See what happens if you donât. Do you sound better? A Balanced Stance While you do need to be relaxed to sing, you also canât be a puddle on the floor. Audiences take performers with a powerful stance more seriously. Practice standing comfortably and openly, without crossing your arms or leaning to one side. Balance your weight across your two feet, on your pelvis, throughout your spine. If you play another instrument while you sing, spend some time finding a good stance for your body while you are doing so. Are you leaning too far forward to look at your guitar strings, for example? What do you think that does to your sound? Confidence If youâve ever seen a great singer perform, you probably noticed that they looked utterly confident. Staying relaxed and standing right are a big part of this: humans register relaxed, open posture as a sign of confidence, and just standing this way can make you feel more confident as well. Practicing aural skills, breath support, and other elements of good singing also helps you feel more confident in your abilities. Got pre-show jitters? Do some slow breathing exercises. Eat a banana (they help the brain produce serotonin). Try holding a power pose, such as the âWonder Woman pose,â for two minutes (this also raises dopamine levels in the brain). Then get out there and have a wonderful time! Elaina R. teaches opera voice and singing in Ann Arbor, MI, as well as through online lessons. She is currently working on a Master of Music at the University of Michigan, and she has a B.M. from the University of Southern California. Learn more about Elaina here! Interested in Private Lessons? Search thousands of teachers for local and live, online lessons. Sign up for convenient, affordable private lessons today! Search for Your Teacher Photo by jus10h
Online Triangular Prism Surface Area Tutors
Online Triangular Prism Surface Area Tutors A triangular prism is a 3-dimensional geometric shape and it belongs to the family of prisms. There are different kinds of prisms like the square prism, rectangular prism etc., and these prisms are all 3-dimensional structures and consist of bases of different shapes. A triangular prism is a prism which has a triangle at its base and hence it consists of two congruent triangles as its bases. The triangular prism is surrounded by 3 parallelograms and the surface area can be calculated by adding the areas of all the surfaces. Example 1: Calculate the area of the triangular prism, whose base of the triangle is 5m and the remaining two sides are 6m, 7m. The height of the triangle is 9m and the length of the prism is 12m. Given: base of the triangle, b= 5m Sides, x= 6m and y= 7m Height of the triangle, h= 9m Length of the prism, l= 12m Surface area of the triangular prism, A = lx+ ly+lb+bh A = (12*6+ 12*7+ 12*5+ 5*9) = 72+ 84+ 60+ 45= 261m2 Hence the Surface area of the triangular prism, A= 261m2 Example 2: Calculate the area of the triangular prism, whose base of the triangle is 8m and the remaining two sides are 9m and 10m. The height of the triangle is 6m and the length of the prism is 13m. Given: base of the triangle, b= 8m Sides, x= 9m and y= 10m Height of the triangle, h= 6m Length of the prism, l= 13m Surface area of the triangular prism, A = lx+ ly+lb+bh A = (13*8+ 13*9+ 13*10+ 8*6) = 104+ 117+ 130+ 48= 399 Hence the Surface area of the triangular prism, A= 399m2
Career Guidance for Teens
Career Guidance for Teens How Can You Help Your Kids with Career Guidance? ChaptersWhat Are the Parentsâ Responsibility for Educational Guidance?Mistakes to Avoid when Guiding Your ChildHow Can You Help Your Child with their Academic and Professional Choices?Are Academic Appraisals Free?âBelieve in your dreams and they may come true; believe in yourself and they will come true.â - AnonymousIn 2017, 32.6% of students went onto university, which means that their A Levels arenât the end of their education. However, many others stop after their GCSEs or A Levels.With better educational guidance, more young people could find their way in the confusing world of education. When it comes to looking for jobs, a lot of teens could do with better career resources and guidance both before and after graduation.While teachers do have a role to play, career exploration and career development start with the parents who can help their teenage child make the right choices for their future.So how can parents help their child with their career planning and career choic es? TraceyPersonal development Teacher 4.92 (9) £25/h1st lesson free!Discover all our tutors NatashaPersonal development Teacher 5.00 (7) £55/h1st lesson free!Discover all our tutors AntonellaPersonal development Teacher 5.00 (1) £15/h1st lesson free!Discover all our tutors IsamPersonal development Teacher 5.00 (3) £30/h1st lesson free!Discover all our tutors AndriyPersonal development Teacher £40/h1st lesson free!Discover all our tutors MichelePersonal development Teacher 4.73 (7) £40/h1st lesson free!Discover all our tutors FlloydPersonal development Teacher 5.00 (11) £40/h1st lesson free!Discover all our tutors OliverPersonal development Teacher 4.33 (4) £25/h1st lesson free!Discover all our tutorsWhat Are the Parentsâ Responsibility for Educational Guidance?Adolescence is a difficult part of a childâs life and the last thing they want to do is to think about their career options and decide upon a career path. Their bodies are changing and theyâre full of hor mones, making them short-tempered. This can put stress on your relationship with your child and many parents often don't know where they stand. A childâs personality is formed during adolescence and rebellion is often part of that process.Find a good personal development course on this platform. Don't worry! You've been guiding your children their entire lives. (Source: ddimitrova)However, this transitional period is also when they need to be thinking about their professional futures and career goals. Believe it or not, they could do with your help and support. While you mightnât be a psychologist or guidance counsellor, you still play a vital role when it comes to educational guidance for your child.There are four main aspects of your role:Communication: discussion and dialogue with your child are essential to ensure you and your child trust one another. Listen to what they want without judgement as this could discourage them from talking to you. They must feel comfortable with opening up because this is a difficult time for the child and itâll allow them to openly express their dreams and aspirations. You can also talk with their teachers to better understand their academic strengths and weaknesses.Encouragement: secondary school students and sixth formers need recogn ition for their achievements. Thinking that good grades are the norm wonât help or encourage them to work harder. Donât hesitate to show them how hard work and effort are related to good results; by working on x, I improved y.Avoid blame: you donât need to put the weight of the world on their shoulders when it comes to choosing their future. Thereâs a strong probability that they feel lost in all of this and that's okay. Your role is to reassure them and remind them that they can always shift careers later on in life.Support: They need to feel supported and guided. Talk to them about your experiences, show them to career and study guidance sites, student forums, and university websites. Show them that youâre by their side and supportive of their choice.As youâll have understood, a parent plays an essential role in helping their child with educational and professional guidance.Find out more about helping your teen with career choices.Mistakes to Avoid when Guiding Your Ch ildNow that you know what your role entails, here are some mistakes you should avoid when trying to help your child. The biggest mistake is thinking that they donât need your help. This is quite paradoxical as your child needs to make their own decisions but they also need your support. Be subtle and donât be overbearing, show that youâre there if they need you and that you have the answers to the questions theyâre asking. You need to make sure they're following the path, not choosing which path they follow. (Source: Pexels)Here are some common misconceptions:A good student doesnât need guidanceGrades arenât importantA childâs personality doesnât matterThe guidance doesnât need to take into account the studentâs wantsHigher education is obligatoryYou donât need to think about their academic and professional futureGuidance counsellors arenât necessaryGood students can be just as lost as struggling students. Just because a student gets good results, it doesnât mean that they know what they want to do with them. School is very different from the world of work. Academic success is important for certain choices but it isnât the only thing that employers take into account. Personality, aspiration, and skills are also often taken into consideration.While degrees used to almost guarantee professional success, this is no longer the case. There are fewer opportunities for those with degrees than in the past. However, the second they get to secondary school, itâs drilled into them that university is everything. By the end of their GCSEs, they need to start focusing on what they want to do.They should take a step back and think about what theyâre interested in professionally and what they like and get in touch with a guidance counsellor.How Can You Help Your Child with their Academic and Professional Choices?As we mentioned previously, parents need to openly communicate with their children, listen to what they want, and help them with guidance.So how can they do this?Firstly, as soon as your child starts secondary school, slowly introduce them to the world of work. In Year 7, children have little interest or idea what work is all about and itâs just something that grown-ups do. Your job is to help them get to where they want to go. (Source: sasint)To help them to make better choices, you need to slowly open the door to the working world:Talk to them about your job and your experience.Bring them to work one day if you can.Explain to them what your jobâs like: hierarchy, schedule, colleagues, tasks, etc.Ask friends and family if they can help them to discover different lines of work.This will help them choose their work experience and find something in a field that theyâre interested in.Donât hesitate to help them do their research. There are plenty of useful sites and resources you can use and student fairs and university open days that you can attend to see which universities and subjects theyâre interested in. You can also help them by encouraging them to ask questions about educational guidance, their future, their personality, and their passions. This is a great way to work out what they want and guide them towards careers that theyâll find en joyable and rewarding.Finally, suggest that they meet a career counsellor to help them.Are Academic Appraisals Free?Academic appraisals and career counselling are useful for helping students decide whatâs best for them by taking several criteria into account. Their exam results, personality, and likes and dislikes are all taken into account to see what line of work is best for them. Your job is to support them and this may include paying for an academic appraisal. (Source: ljcor)Some will struggle to find a career if they don't explore career options, get career coaching, or develop interviewing skills. Job hunting is tough when you know what you want to do, they need to ask themselves âWhat can I do?â and âWhat do I want to do?â and academic appraisals will help them answer the former. Attending a career fair could be a good way to answer the latter.Not everybody's suited to academia and maybe a vocational course might be better and present them with more job opportunities. Usually, there are career services who can get you a career counsellor can help them with this but you'll have to pay for it.This is the first step towards better understanding who they are and what theyâll be good at, even if the student already has a good idea of what they want to do. However, the point of an academic appraisal is to help put together a plan of what they can do and how they can do it.There are plenty of these online but itâs best to do one face-to-face with a career counsellor. This might take some time, so talk to the counsellor about how long itâll take. Itâll be worth it because theyâll have a lot of answers by the end of it. Certain students might need educational guidance or additional tutoring.You can also find academic support tutors on Superprof to help your child regain confidence in their skills and make better choices for their career. You can expect to pay anywhere between £25 and £100 per hour depending on the tutorâs qualifications and experience. Effectively, the tutor can act as a career coach, helping them come up with a career plan, develop interview skills, discover employment opportunities, writing cover letters, etc.Find out more about the cost of educational guidance.So are you ready to help your child with educational guidance?
SAT Exam Online SAT Prep Online Tutoring Tutorpace
SAT Exam Online SAT Prep Online Tutoring Tutorpace Scholastic Assessment test, popularly known as SAT is the exam taken by all the high school students who plan to study in colleges and universities in the United States. SAT exam is conducted many times a year and students residing in the U.S or other countries can register online and take the test. SAT exam is owned by the College Board and students who wish to take the SAT should register on the College Board official website and pay for the exam. SAT exam scores are preferred by many colleges and universities throughout the United States as it reflects the academic knowledge of the student. SAT examines students in various sections and it prepares them to take up college level academics. SAT exam paper tests students in 3 important sections and they are Critical Reading, Mathematics and Writing. The performance on these sections depends on the students logical skills and time management skills. Students are allowed to use calculators for the exam and if the students have graphing calculators, then they will be able to answer some questions more quickly. It is recommended for the students not to guess the answers for questions which they have no idea about, as there is negative penalty for the wrong answers. This implies that with one single wrong answer, the already existing score is reduced. So students can mark the answer only when they are sure about it. If the students have good understanding of the concepts learnt up until till high school, then they can get good scores.
5 Tips for Women How to Lead a Balanced Life and Successful Career - Introvert Whisperer
Introvert Whisperer / 5 Tips for Women How to Lead a Balanced Life and Successful Career - Introvert Whisperer 5 Tips for Women How to Lead a Balanced Life and Successful Career In todayâs modern world, there seems to be a better balance between the genders. It is almost a necessity for both men and women in the family to head off to work to keep up with living expenses, especially if there are kids in the picture. However, it seems that women are the ones whom often struggle between work and family obligations and other desires. Some women even feel they must choose work or family but not both. This is not the case at all. With these five tips for women how to lead a balanced life and have a successful career, work and family are both possible. 1. Ask Your Employer About Flex Work This is a great option if you are seeking new employment since you will probably already be aware of your current employerâs stance on working from home. There are many employers that make use of workforce management software that allows employees to work from home, at least some days of the week . You could take advantage of that opportunity and this will allow you to schedule your time around any family obligations within the daytime hours. You wouldnât miss the school concert, a teacher interview or a hot yoga class you have wanted to enrol in for some time. Important to note about flex work is that your employer may require you to be online at particular intervals; you may need to upgrade your home PC setup; you may take a pay cut, at least for any hours worked from home. 2. Get in Some âMeâ Time Everyone talks about how important âmeâ time is for people, especially busy Momâs but few women take this advice. Maybe you are having a hard time finding enough time to give yourself, or maybe you donât know what to do with yourself. Whatever the case, you need to make yourself a priority just as you do your partner and/or children. Donât get caught up in âwhat do I do?â First, schedule that âmeâ time right into your calendar. If you only have a 30-minute window free, give it to yourself. You donât have to write down what you are doing, or where you are going, just write âMEâ. When you get to your âmeâ time in the day, think of a hobby or interest you have. Even if you just go sip a coffee or tea for a half hour and read the paper, this time of just you will be beneficial. Some rules for âmeâ time are important to note: Canât be used for grocery shopping or shopping for anyone else but yourself Running errands is a no-no Daily living or hygiene routines do not count (i.e. shower, blow drying hair, going to the bathroom) Spouses or partners may not intrude upon this âmeâ timeâ"this would be called âtogether timeâ You cannot do any kind of workforce management during âmeâ time; i.e. no scheduling meetings, returning emails or answering phone calls. 3. Take Dinner Out in the Morning There is nothing worse than getting home from a long day at work and then being faced with the decision of what to make for dinner. It just adds stress to what was already a stressful day and we all make poor food choices if we are tired, unmotivated and overwhelmed. Plan ahead by heading to the freezer for your choice of meat or other entrée so that it can be fully thawed by dinner and you already have a clear idea of where you are going with dinner. This also helps if you are running late and someone else can jump in and start dinner for you. Better still is if you can get dinner started in the morning using a slow cooker. You will arrive home to a fully cooked, delicious smelling meal. However, this means you will need to get up earlier in the morning so if you are not a morning person, skip this. 4. Make it a Date! When I say date, I donât only mean with your spouse but also with your kids if you have any. Just as you scheduled in âmeâ time, be sure to physically schedule in a time for your family members. It can be weekly, not necessarily daily. For example, pencil in for two hours on Saturday morning a trip to the park and a little picnic with a snack. This gives you something to look forward to for you and the family. Bring no work distractions with you when you are having date time with the family. This date time also transcends to your spouse. It is very important to stay connected as a couple and make time to be alone. This could be going to bed an hour early and just talking or cuddling, watching your favorite TV show together for an hour or it could be a formal date to show and dinner. Whatever you choose, make it happen at least three times a week. 5. Ask for Help Asking for help is one of the hardest things to do for many women. It is often seen as a sign of weakness or neediness, but this is NOT true. In fact, the opposite! Asking for help shows that you understand your limitations and that you want to take charge of the situation before it gets unmanageable. Ask for help from your spouse/partner, your family and your friends. Donât be discouraged if they cannot help, just ask another person until you get the help you need. Just remember you are not alone. Balancing a career and home life is completely possible if you have the determination and understanding that each has its place in your life. Following these five tips will put you on the right track to workforce management along with enjoying important home time with your family. Author Bio Jamie is a mother to 8 children and an avid cook. She enjoys theatre from both the audience as well as being on stage. She has been writing stories ever since she could put pen to paper and still enjoys doing so today. Her passion for food has her often creating new recipes to try on her family, who are always happy to sample. Jamie graduated with a diploma in Social Services and has worked with children for most of her life. She now writes for Advancesystemsinc and help them in their content promotions. Go to top Do you know what your next career step is? Many people donât. I want to help you accelerate your career by connecting you with your Free Instant Access to my eBook on how to construct your Career SMART Goals â" that will help you put together your actions and keep you accountable. Get your copy now and start your action plan today! Brought to you by Dorothy Tannahill-Moran â" dedicated to unleashing your professional potential. Introvert Whisperer
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