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1 2 1 2 1 1 1
1 2 1 2 ^ 1 < 0 > 1
1 2 1 1 ^ ^ 0 > < 0
0 > 2 < 0 v v 1
1 < 0 > 1 v 3 1 1 3
< 0 > < 0 > v v 3 1 1 3
3 < 0 > < 0 > 3