C11112331312111112111133133313331333132313123133313231333131211113313232233111   >>    C1111233131211111211113313331333133313231312313331323133313121111331323223311   <<    C11112331312111112111133133313331333132313123133313231333131211113313232233113   >>      C11112331312111112111133133313331333132313123133313231333131211113313232233112   >>