C12313211232233312111111312111133133313331323133322233121232233322121   >>    C1231321123223331211111131211113313331333132313332223312123223332212   <<    C12313211232233312111111312111133133313331323133322233121232233322123   >>      C12313211232233312111111312111133133313331323133322233121232233322122   >>