ttbyq shifting backward by 1: ssaxp (not English). Try Atbash (A↔Z, B↔Y, etc.):
Try akhr = ekhr → e?h? maybe e a r ? hmm.
Let’s check akhr = a=e, k=a, h=r, r=t → ‘e a r t’ = earth. Works with r=t. Then asdar : a=e, s=?, d=d, a=e, r=t → e ? d e t. If s=n → ‘endet’ — not English. Maybe s=‘n’ but last r=t → ‘ended’? No, that’s d at end. Actually ended = e n d e d, so last letter should be d, not t. So r cannot be t if last word is ended . Contradiction. ttbyq wyak mhkr akhr asdar
So maybe last word is not ‘ender’ but ‘endet’ is nonsense. So my a=e guess fails unless asdar ≠ ‘ender’. Let’s try asdar = ‘after’? a=e? No, ‘after’ has f. So maybe a is not e.
The phrase is: ttbyq wyak mhkr akhr asdar ttbyq shifting backward by 1: ssaxp (not English)
Check earlier wyak with a=e, k=a, so wy e a = wy e a . If w→w, y→h, then w h e a = ‘whea’? ‘whe a’? ‘when’? Needs n. Possibly y→h, then wyak = w h e a → ‘whea’? Actually if y→h, w→w, a=e, k=a → ‘w h e a’ — could be ‘whe a’ for ‘wheat’? Missing t.
If the key is short, maybe ttbyq could be hello or there ? Check ttbyq vs hello : h(7) to t(19) = +12; e(4) to t(19) = +15; l(11) to b(1) = -10; l(11) to y(24) = +13; o(14) to q(16) = +2 — not a constant shift, so not Caesar. But repeating key? Then asdar : a=e, s=
Then akhr = e?hr = e?h r . If k→a, then eahr — ‘ear h’? or e a r h → ‘earth’? Yes! k→a, h→r, r→t. That fits: k=a, h=r, r=t.
Let’s guess ttbyq = there : t→t shift 0 t→h? no, t=19, h=7 → shift -12 or +14? Better to try key guessing. Not getting clear pattern quickly.
Given symmetry, maybe it’s a simple Atbash first, then read? Atbash whole thing: t→g, t→g, b→y, y→b, q→j → ggybj w→d, y→b, a→z, k→p → dbzp m→n, h→s, k→p, r→i → nspi a→z, k→p, h→s, r→i → zpsi a→z, s→h, d→w, a→z, r→i → zhwzi
ggybj dbzp nspi zpsi zhwzi — looks random.