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921 is equivalent to 37
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Related: 18/21 and 3/7 9/21 and 6/7 9/42 and 3/7 9/21 and 3/14 27/21 and 3/7 9/21 and 9/7 9/63 and 3/7 9/21 and 3/21 45/21 and 3/7 9/21 and 15/7 9/21 and 3/35 63/21 and 3/7 9/21 and 21/7 9/21 and 3/49
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