C1111133313331323223313331333133313311211111211331333133313233313113311231   >>    C111113331333132322331333133313331331121111121133133313331323331311331123   <<    C1111133313331323223313331333133313311211111211331333133313233313113311233   >>      C1111133313331323223313331333133313311211111211331333133313233313113311232   >>