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ACROSS
1)  a principle or condition that customarily governs behavior
2)  chocolate cookie with white cream filling
3)  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
4)  a number of sheets of paper fastened together along one edge


DOWN
1)  an easy victory
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)  an advantage held by a competitor in a race
4)  the longest division of geological time

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