C1111133313331323223313331333133313331323131211113313113313233311232313221   >>    C111113331333132322331333133313331333132313121111331311331323331123231322   <<    C1111133313331323223313331333133313331323131211113313113313233311232313223   >>      C1111133313331323223313331333133313331323131211113313113313233311232313222   >>