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1220 is equivalent to 610
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Related: 24/20 and 6/10 12/20 and 12/10 12/40 and 6/10 12/20 and 6/20 36/20 and 6/10 12/20 and 18/10 12/60 and 6/10 12/20 and 6/30 60/20 and 6/10 12/20 and 30/10 12/20 and 6/50 84/20 and 6/10 12/20 and 42/10 12/20 and 6/70
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