Contractions are not appropriate in formal writing but often used in daily conversation. Some examples of contractions are:
don't
can't
isn't
won't
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Obsessive Compulsive Disorder can involve the behavior of list
writing
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journal.
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There are many places where one can find information on writing
a business thank you note. One can find information on writing a
business thank you note at popular on the web sources such as Daily
Writing Tips and WikiHow.