C12313211232233312111111312111133133313331333113332211323323311   >>    C1231321123223331211111131211113313331333133311333221132332331   <<    C12313211232233312111111312111133133313331333113332211323323313   >>      C12313211232233312111111312111133133313331333113332211323323312   >>