2 + 3 + 5 = 5 + 3 + 2, so you can add 2 and 3 first and then add 5.
Find the sum by adding down.
4
3 +8
3
2 +7
5
1 +8
7
5 +4
8
3 +6
2
7 +9
3
5 +4
4
2 +5
6
7 +2
2
3 +4
5
3 +2
1
6 +3
2
1 +8
3
4 +6
4
1 +6
4
2 +6
5
4 +3
2
5 +7
2
4 +3
3
1 +7
5
7 +1
2
6 +3
7
1 +5
1
9 +5
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