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a. not planned but done because you suddenly want to do it
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n. a thin pointed piece of metal like a nail with a raised spiral line along it and a line or cross cut into its head
adj.at or near the back of sth. ; n. the back part of sth.
v. to rub your skin with your nails, usually because it is itching; n. a mark, a cut or an injury made by scratching sb. 's skin or the surface of sth.
n. an area of activity, interest, or knowledge
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