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ACROSS
1)  work doggedly or persistently
2)  a whetstone made of fine gritstone; used for sharpening razors
3)  assist or encourage, usually in some wrongdoing
4)  english pianist (1890-1965)


DOWN
1)  title for the former hereditary monarch of iran
2)  (anatomy) a somewhat rounded subdivision of a bodily organ or part
3)  the smallest whole number or a numeral representing this number
4)  a return on a shot that seemed impossible to reach and would normally have resulted in a point for the opponent

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