Correct: 7 + 3 = 10, 6 + 4 = 10, 12 + 8 = 20, 17 + 3 = 20, 19 + 1 = 20, 19 + 0 = 19, 2 + 16 = 18, 10 + 7= 17,  4 + 12 = 16, 15= 5 + 10, 16= 7 + 9, 5= 4 + 1, 6= 3 + 3, 7= 3 + 4, 8= 4 + 4, 9= 5 + 4, 10= 6 + 4, 9 + 2= 11, 12= 10 + 2, 13= 7 + 6, 19= 17 + 2, 18= 10 + 8, 17= 9 + 8, 16= 8 + 8, 15= 11 + 4, 14= 12 + 2, 13= 13 + 0, 12= 6 + 6, 11= 10 + 1, 9= 2 + 7 , Incorrect: 7 + 2 = 10, 17 + 2 = 20, 5 + 17 = 20, 3 + 8 = 10, 4 + 8 = 20, 18 + 1 = 20, 20 + 1 = 20, 13 + 5 = 20, 19 + 1 = 19, 15= 6 + 10, 7= 3 + 9, 5= 4 + 2, 13= 7 + 20, 17= 9 + 9, 18= 10 + 10, 9= 5 + 5, 10= 6 + 10, 12= 10 + 3, 13= 7 + 9, 6= 3 + 4, 7= 3 + 5, 8= 4 + 6, 10= 6 + 5, 13= 7 + 10, 19= 17 + 3, 15= 11 + 5, 18= 10 + 3, 15= 11 + 8, 12= 6 + 60, 9= 2 + 2,

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