my ($x, $y) = qw(5 10);
my @A = (
   [ ([$x, $y  ]), ([$x+1, $y  ]), ([$x+2, $y  ]), ([$x+3, $y  ]) ],
   [ ([$x, $y+1]), ([$x+1, $y+1]), ([$x+2, $y+1]), ([$x+3, $y+1]) ],
   [ ([$x, $y+2]), ([$x+1, $y+2]), ([$x+2, $y+2]), ([$x+3, $y+2]) ],
   [ ([$x, $y+3]), ([$x+1, $y+3]), ([$x+2, $y+3]), ([$x+3, $y+3]) ],
);