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use strict;
use warnings;
...
M X15 1 2 1 1 1 1 
M X16 1 1 2 2 2 2 
M X17 1 2 2 2 2 2

use strict;
use warnings;
...
M X2 2 1 1 1 1 1
M X3 1 2 2 2 2 2
M X4 2 2 2 1 1 2

X1: col 12, 1st: 1
    does not match
...
    does not match
    does not match
    matches