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18 - 37 is -1756.
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Related: 2/8-3/7 1/8-6/7 1/16-3/7 1/8-3/14 3/8-3/7 1/8-9/7 1/24-3/7 1/8-3/21 5/8-3/7 1/8-15/7 1/40-3/7 1/8-3/35 7/8-3/7 1/8-21/7 1/56-3/7 1/8-3/49
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