c ccc ccccccccc ccc
kkkkkkkk b ccc
          vvvvD ccc ccccccc ccc cccc
          vvvv  ccc ccccccc ccc cccc
         b o fffffffffffffffffb ccc
                               vvvD ccc ccccccc ccc ccc
                               vvv  ccc ccccccc ccc ccc
                              b
    vvvv o dddD
    vvvv o dddD
kkk			    
