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13 - 19 is 29.
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Related: 2/3-1/9 1/3-2/9 1/6-1/9 1/3-1/18 1/3-3/9 1/9-1/9 1/3-1/27 5/3-1/9 1/3-5/9 1/15-1/9 1/3-1/45 7/3-1/9 1/3-7/9 1/21-1/9 1/3-1/63
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