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ACROSS
1)  joint consisting of a line formed by joining two pieces
2)  someone new to a field or activity
3)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
4)  any of various edible seeds of plants of the family leguminosae used for food


DOWN
1)  a short piece remaining on a trunk or stem where a branch is lost
2)  a republic consisting of 26 of 32 counties comprising the island of ireland; achieved independence from the united kingdom in 1921
3)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
4)  an utterance expressing pain or disapproval

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