C1111233131211111211113313331333133313331333133313331333133313112123311211   >>    C111123313121111121111331333133313331333133313331333133313331311212331121   <<    C1111233131211111211113313331333133313331333133313331333133313112123311213   >>      C1111233131211111211113313331333133313331333133313331333133313112123311212   >>