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1221 is equivalent to 47
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Related: 24/21 and 4/7 12/21 and 8/7 12/42 and 4/7 12/21 and 4/14 36/21 and 4/7 12/21 and 12/7 12/63 and 4/7 12/21 and 4/21 60/21 and 4/7 12/21 and 20/7 12/21 and 4/35 84/21 and 4/7 12/21 and 28/7 12/21 and 4/49
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