Correct: 60 + 40, 50 + 50, 70 +30, 80 + 20, 20 +80, 40 +60, 30 +70, Incorrect: 70 +70, 40 +40, 30 +30, 8 +2, 16 +16, 80 + 80, 100 =100, 10000, 0,

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