C11112331312111112111133133313331333132313133313113313232213111   >>    C1111233131211111211113313331333133313231313331311331323221311   <<    C11112331312111112111133133313331333132313133313113313232213113   >>      C11112331312111112111133133313331333132313133313113313232213112   >>