twenty, 15 + 5 =, twelve, 15 - 3 =, thirteen, 7 + 6 =, fifteen, 20 - 5 =, eighteen, 9 + 9 =, zero, 19 - 19 =, eleven, 6 + 5 =, fourteen, 16 - 2 =, ten, 0 + 10 =, sixteen, 8 + 8 =, seventeen, 9 + 8 =, three, 15 - 12 =, nineteen, 20 - 1 =, eight, 20 - 12 =, nine, 5 + 4 =

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