So maybe it's : d → f a → s n → m l → ; w → e d → f → fsm;ef (no).
Conclusion: not a simple adjacency shift. Try (A↔Z, B↔Y, etc.). 2. Try Atbash Cipher Atbash: A↔Z, B↔Y, C↔X, …, M↔N. danlwd fyltr shkn asb aby
Check “fyltr” – maybe “filter” typed with y instead of i (finger slip). Yes: f i l t e r → f y l t r (missing e, but possible). “shkn” → “shaken” or “shkin” (skin). “asb” → “asb” maybe “as b” or “has b”. “aby” → “aby” = “a by” or “abby”. So maybe it's : d → f a