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