40/143 - 41/156 = (40 * 12 - 41 * 11)/1716 = 480/1716 - 451/1716 = 29/1716
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40/143 - 41/156 = (40 * 12 - 41 * 11)/1716 = 480/1716 - 451/1716 = 29/1716