C11111333133313232233133313331333133313231312111133131123332221   >>    C1111133313331323223313331333133313331323131211113313112333222   <<    C11111333133313232233133313331333133313231312111133131123332223   >>      C11111333133313232233133313331333133313231312111133131123332222   >>