C1111233131211111211113313331333133313331333133313331333133313233231121221   >>    C111123313121111121111331333133313331333133313331333133313331323323112122   <<    C1111233131211111211113313331333133313331333133313331333133313233231121223   >>      C1111233131211111211113313331333133313331333133313331333133313233231121222   >>