c ccc ccccccccc ccc
c ccc cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
kkkkkkkk ffffffffffffffffffffffffff
   kkkkkkk btttttt o BBBBBBBBBb
      kkkkkkkk vvv o fffffffbvvvDvvvvvvvvb
         ccc
      kkk
   kkk
   kkkkkkk btttttt o BBBBBBBb
      kkkkkkkk vvv o fffffffbvvvDvvvvvvvvb
          ccc
      kkk
   kkk
kkk
