C11112331312111112111133133313331333132313233313232233132332211   >>    C1111233131211111211113313331333133313231323331323223313233221   <<    C11112331312111112111133133313331333132313233313232233132332213   >>      C11112331312111112111133133313331333132313233313232233132332212   >>