C1111121111331311211331333133313331313331323132233133313232212121   >>    C111112111133131121133133313331333131333132313223313331323221212   <<    C1111121111331311211331333133313331313331323132233133313232212123   >>      C1111121111331311211331333133313331313331323132233133313232212122   >>