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ACROSS
1)  an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  a facial expression of contempt or scorn; the upper lip curls
4)  posing no difficulty; requiring little effort


DOWN
1)  period extending from dec. 24 to jan. 6
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  a short time
4)  (used with singular count nouns) colloquial for `not a' or `not one' or `never a'

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yawn
urea
leer
easy