C12313211232233312111111312111133133313331323133323232322131232221   >>    C1231321123223331211111131211113313331333132313332323232213123222   <<    C12313211232233312111111312111133133313331323133323232322131232223   >>      C12313211232233312111111312111133133313331323133323232322131232222   >>