10 + 10
20
20 + 10
30
30 + 10
40
40 + 10
50
10 + 20
1 + 2
3
2 + 1
3+ 5
8
4 + 9
14
5 + 7
12
300 x 1
300
52 + 2
54
22+ 2
24
45+5
7+ 7
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