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ACROSS
1)  (sports) the chief official (as in boxing or american football) who is expected to ensure fair play
2)  a militant organization of irish nationalists who used terrorism and guerilla warfare in an effort to drive british forces from northern ireland and achieve a united independent ireland
3)  a thick flat pad used as a floor covering


DOWN
1)  the shape of a raised edge of a more or less circular object
2)  a period marked by distinctive character or reckoned from a fixed point or event
3)  a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides)

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