So Vigenère with given key not obvious. Example: awyks could be “a wyks” → “a wyks” = “a weeks” if y=e (common e→y shift in some simple ciphers). Test: awyks → a=a, w→w? no shift consistency.
f→f (same) y→i (y→i shift -8?) not consistent. Let’s check: f→f (0), y→i (y=25, i=9, diff -16 or +10 mod26), inconsistent. danlwd Ox Vpn bray andrwyd fyltrshkn aw ayks wy py an
Key “oxvpn”: length 5: d(3)-o(14)=15=p a(0)-x(23)=3=d n(13)-v(21)= -8=18=s l(11)-p(15)= -4=22=w w(22)-n(13)=9=j d(3)-o(14)=15=p → pdswjp no. So Vigenère with given key not obvious
d → s a → (nothing left of a) maybe ' or wrap? No. diff -16 or +10 mod26)
If Ox = key (O=15th letter, x=24th), maybe key length 2.