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guilty: I recall a time when I had to go to my cousin's birthday part, and I overslept! I felt really guilty about that.
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It is something that was really important to her, and I still feel bad that I missed her 15th birthday 
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Who is she?
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My cousin, she really wanted me to attend her party since she enjoys my cooking and I had planned on making cookies
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That is bad. Did you bought her a good present so she can forget about it?