C1111233131211111211113313331333133313331312211113313331121131212121   >>    C111123313121111121111331333133313331333131221111331333112113121212   <<    C1111233131211111211113313331333133313331312211113313331121131212123   >>      C1111233131211111211113313331333133313331312211113313331121131212122   >>