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18 - 57 is -3356.
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Related: 2/8-5/7 1/8-10/7 1/16-5/7 1/8-5/14 3/8-5/7 1/8-15/7 1/24-5/7 1/8-5/21 5/8-5/7 1/8-25/7 1/40-5/7 1/8-5/35 7/8-5/7 1/8-35/7 1/56-5/7 1/8-5/49
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