C1111233131211111211113313331333133313331333133313331333133313233313112221   >>    C111123313121111121111331333133313331333133313331333133313331323331311222   <<    C1111233131211111211113313331333133313331333133313331333133313233313112223   >>      C1111233131211111211113313331333133313331333133313331333133313233313112222   >>