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ACROSS
1)  a mechanical device that moves fluid or gas by pressure or suction
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  any rational or irrational number
4)  united s____s poet and critic (1899-1979)


DOWN
1)  something determined in relation to something that includes it
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)  the flesh of animals (including fishes and birds and snails) used as food
4)  a wooden strip forming part of a fence

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