BBBBBBBBBBBBBBBc
BAAAAAAAAAAAAABc
BABABABABABABABc
BAAAAAAAAAAAAABc
BABABABABABABABc
BAAAAAAAAAAAAABc
BABABABABABABABc
BAAAAAAAAAAAAABc
BBBABABABABABABc
BBBBAAAAAAAAAABc
BBBBBBBBBBBBBBBc