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7+4+1+9+10
Add 2 and 5 to get 7.
11+1+9+10
Add 7 and 4 to get 11.
12+9+10
Add 11 and 1 to get 12.
21+10
Add 12 and 9 to get 21.
31
Add 21 and 10 to get 31.