8/8 - 3/8+5/8=...., 3/7 - 5/7-2/7=...., 3/8 - 6/8+1/8-4/8=...., 4/7 - 5/7-3/7+2/7=...., 7/12 - 3/12-2/12+6/12=...., 5/12 - 6/12+2/12-3/12=....,

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