C12313211232233312111111312111133133313331323133313331122332321132332211121   >>    C1231321123223331211111131211113313331333132313331333112233232113233221112   <<    C12313211232233312111111312111133133313331323133313331122332321132332211123   >>      C12313211232233312111111312111133133313331323133313331122332321132332211122   >>