C1111133313331323223313331333133313311211111211331333131232223221   >>    C111113331333132322331333133313331331121111121133133313123222322   <<    C1111133313331323223313331333133313311211111211331333131232223223   >>      C1111133313331323223313331333133313311211111211331333131232223222   >>