Correcto: 10 + 8, 8 + 10, 17 + 1, 1+ 17, 19 - 1, 16 + 2, 2 + 16, 15 + 3, 3+ 15, 18 + 0, 20 - 2, 21 - 3, 22 - 4, 14+4, 4 + 14, Incorrecto: 10+ 10, 20 + 1, 1 + 21, 1+ 20, 10+ 2, 10+ 3, 10+ 4, 10+ 5, 10 + 6, 10 +7, 7 +10, 6 +10, 5 +10, 15+ 2, 2 +15,

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