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#!/usr/bin/perl
use warnings;
...
[3,1] -[3,2] 1[3,3] 1[3,4] -[3,5] -
[4,1] -[4,2] -[4,3] -[4,4] 1[4,5] 1
[5,1] -[5,2] -[5,3] -[5,4] 1[5,5] 1