C1111233131211111211113313331333133313331312211111133133313331333132322121   >>    C111123313121111121111331333133313331333131221111113313331333133313232212   <<    C1111233131211111211113313331333133313331312211111133133313331333132322123   >>      C1111233131211111211113313331333133313331312211111133133313331333132322122   >>