C312312111111331312111133133313331333131331123313331323221212121   >>    C31231211111133131211113313331333133313133112331333132322121212   <<    C312312111111331312111133133313331333131331123313331323221212123   >>      C312312111111331312111133133313331333131331123313331323221212122   >>