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ACROSS
1)  implement consisting of a small piece of cotton that is used to apply medication or cleanse a wound or obtain a specimen of a secretion
2)  the dressed skin of an animal (especially a large animal)
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)  a portable shelter (usually of canvas stretched over supporting poles and fastened to the ground with ropes and pegs)


DOWN
1)  move so that an opening or passage is obstructed; make ____
2)  ligament made of metal and used to fasten things or make cages or fences etc
3)  an important port of yemen; located on the gulf of ____; its strategic location has made it a major trading center of southern arabia since ancient times
4)  a regular route for a sentry or policeman

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