C11111333133313232233133313331333133313232233312111133132211121   >>    C1111133313331323223313331333133313331323223331211113313221112   <<    C11111333133313232233133313331333133313232233312111133132211123   >>      C11111333133313232233133313331333133313232233312111133132211122   >>