my %hash;

$hash{key1} = [ [0 0, 0 1, 0 0, 1 1, 0 0, 0 1,],   # first block
                [0 0, 0 0, 0 0, 0 1, 0 1, 0 0,],   # second block
				[0 1, 0 0, 0 0, 0 1, 0 0, 0 0,],   # third block
               ];
$hash{key2} = [ [0 0, 0 0, 0 0, 0 1, 1 1, 0 0,],   # first block
                [0 0, 0 1, 0 0, 0 0, 0 0, 0 0,],   # second block
                [0 0, 1 1, 0 0, 1 1, 0 0, 1 0,],   # third block
               ];