C11112331312111112111133132313331333133313233313331312111133133313232212131   >>    C1111233131211111211113313231333133313331323331333131211113313331323221213   <<    C11112331312111112111133132313331333133313233313331312111133133313232212133   >>      C11112331312111112111133132313331333133313233313331312111133133313232212132   >>