C11111333133313232233133313331333133313331312111133133313231333132313232212131   >>    C1111133313331323223313331333133313331333131211113313331323133313231323221213   <<    C11111333133313232233133313331333133313331312111133133313231333132313232212133   >>      C11111333133313232233133313331333133313331312111133133313231333132313232212132   >>