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use 5.014; use warnings;
our($R, $C, $M) = (14, 14, 7);
...
}
say "done searching (R=$R, C=$C, M=$M).";
__END__

Found solution: [
 . P . P . . . P . P . . . .
...
 . . . P P . .              
]
done searching (R=14, C=14, M=7).