C312312111112111113121333133313331333133313331323132313232212121   >>    C31231211111211111312133313331333133313331333132313231323221212   <<    C312312111112111113121333133313331333133313331323132313232212123   >>      C312312111112111113121333133313331333133313331323132313232212122   >>