C11111333133313232233133313331333133313233213331323221323131221   >>    C1111133313331323223313331333133313331323321333132322132313122   <<    C11111333133313232233133313331333133313233213331323221323131223   >>      C11111333133313232233133313331333133313233213331323221323131222   >>