c ccc ccccccccc ccc
kkkkkkkk ffffffffffffffffffffffffffffffffff
    kkkkkkkkkk bttttttttt o BBBBBBBD ttttttttt o boddddddddddbb
        PPPPPPPPP
        PPPPPPPPP
    kkk
    kkkkkkkkkk bttttttttb
        PPPPPPPPP
    kkk
kkk
