C11111333133313232233133313331333133313231312111111221123222221   >>    C1111133313331323223313331333133313331323131211111122112322222   <<    C11111333133313232233133313331333133313231312111111221123222223   >>      C11111333133313232233133313331333133313231312111111221123222222   >>