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use strict;
use warnings;
...
16|                   | G                                 |       |16
   --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
    A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P

Y moves from B14 to A14
Y moves from A14 to A12
...
Y moves from C12 to C9

Time consumed: 40.0800559520721