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ACROSS
1)  something that bulges out or is protuberant or projects from its surroundings
2)  an elaborate song for solo voice
3)  the process whereby heat changes something from a solid to a liquid
4)  a reason for wanting something done


DOWN
1)  meat cut from the thigh of a hog (usually smoked)
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 white nutritious liquid secreted by mammals and used as food by human beings
4)  liver or meat or fowl finely minced or ground and variously seasoned

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