7 + 8 = …, 13, 15, 17, 11, 9 + 6 = …, 15, 16, 17, 18, 8 + 5 = …, 11, 12, 13, 15, 15 − 7 = …, 5, 6, 7, 8, 18 − 9 = …, 10, 9, 8, 11, 14 − 6 = …, 8, 10, 7, 6, 23 + 15 = …, 35, 36, 38, 37, 47 + 18 = …, 67, 66, 65, 68, 34 + 26 = …, 60, 61, 62, 64, 68 + 14 = …, 81, 80, 82, 83.

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