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ACROSS
1)  steadiness of mind under stress
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 respiratory disease of unknown etiology that apparently originated in mainland china in 2003; characterized by fever and coughing or difficulty breathing or hypoxia; can be fatal


DOWN
1)  the thick white fluid containing spermatozoa that is ejaculated by the male genital tract
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  british artist and writer of nonsense verse (1812-1888)
4)  a thick flat pad used as a floor covering

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