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ACROSS
1)  diurnal bird of prey typically having short rounded wings and a long tail
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)  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
4)  something determined in relation to something that includes it


DOWN
1)  something that bulges out or is protuberant or projects from its surroundings
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  impairment resulting from long use
4)  influential german idealist philosopher (1724-1804)

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hawk
urea
mean
part