>v>>>>>>>>>>>>>>>>>v
 v^<<<<<<<?>>>>>>>>v
 v        ^        v
 v                 v
 v                 v
 v   >    ?    <   v
v<        1        >v
>v        ^        v<
 v                 v
 v    v<<<?<<<<    .
 v    >       ^    <
 >v               >^
  >v >>>>>>>>>>>>>^
   >v^<<<<<<<<<<<
    >>>>>v >>>>>^
         >>^