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$1.............$2BBBBB$1....$2BBBBBBBBBBB$1.........
$1..............$2BBBB$1...$2BBbb$1....$2bbbb$1.........
$1.......$2BBBB$1.....$2bbb$1..$2B$1....................
$1......$2BBBBBB$1...........$2bBBBBBB$1............
$1......$2BBBBBBBBB$1...$2Bb$1.$2BB$1..$2bBBBBBB$1..........
$1.......$2bBBBBBBBBBBb$1..$2BBB$1...$2BBBBBB$1.........
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