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use strict;
use warnings;
...
0 1 2 3 4 5 6 7 8 9 10 11
1 1 2 2 4 5 2 7 8 9 10 11
2 1 2 1 4 5 9 7 8 9 10 11

2, 4, 5, 2, 10, 11
3, 4, 5, 6, 10, 11
1, 4, 5, 9, 10, 11