C11111333133313232233133313331333133313232233312111133132221222121   >>    C1111133313331323223313331333133313331323223331211113313222122212   <<    C11111333133313232233133313331333133313232233312111133132221222123   >>      C11111333133313232233133313331333133313232233312111133132221222122   >>