21 + 10 = ____
52 + 90 = ____
73 + 23 = ____
82 + 40 = ____
92 + 89 = ____
12 + 3 = ____
53 + 63 = ____
42 + 3 = ____
52 + 30 = ____
2 + 83 = ____
32 + 22 = ____
31 + 53 = ____
72 + 12 = ____
97 + 40 = ____
53 + 99 = ____
83 + 52 = ____
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