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1220 is equivalent to 915
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Related: 24/20 and 9/15 12/20 and 18/15 12/40 and 9/15 12/20 and 9/30 36/20 and 9/15 12/20 and 27/15 12/60 and 9/15 12/20 and 9/45 60/20 and 9/15 12/20 and 45/15 12/20 and 9/75 84/20 and 9/15 12/20 and 63/15
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