__--~~~~~~~--__
        _-~~ H +~ _A_ ~+ H ~~-_
      /~ +_ ~V~ _+ H +_ ~V~ _+ ~\
    /~=X===>-+-<===X===>-+-<===X=~\
   /~+ H +~ _A_ ~+ H +~ _A_ ~+ H +~\
  /+_ ~V~ _+ H +_ ~V~ _+ H +_ ~V~ _+\
 f===>-+-<===X===>-+-<===X===>-+-<===?
fH +~ _A_ ~+ H +~ _A_ ~+ H +~ _A_ ~+ H?
|V~ _+ H +_ ~V~ _+ H +_ ~V~ _+ H +_ ~V|
|+-<===X===>-+-<===X===>-+-<===X===>-+|
|A_ ~+ H +~ _A_ ~+ H +~ _A_ ~+ H +~ _A|
tH +_ ~V~ _+ H +_ ~V~ _+ H +_ ~V~ _+ Hj
 t===>-+-<===X===>-+-<===X===>-+-<===j
  \+~ _A_ ~+ H +~ _A_ ~+ H +~ _A_ ~+/   =W.L.=
   \_+ H +_ ~V~ _+ H +_ ~V~ _+ H +_/
    \_=X===>-+-<===X===>-+-<===X=_/
      \_ +~ _A_ ~+ H +~ _A_ ~+ _/
        ~-__ H +_ ~V~ _+ H __-~
            ~~--_______--~~

            [===> [0] <===]