1) (⫯f)@(1) = 1
2) f@❨d-n❩ = k → n <= d → (f∘𝐮❨n❩)@❨d❩ = k
3) f@❨d-1❩ = k-1 → 1 < d → 1 < k → (⫯f)@❨d❩ = k


lemma pr_pat_after_uni_tls (i2) (i1):
      ∀f2. @❨i1, f2❩ ≘ i2 →
      ∀f. 𝐮❨i2❩ ⊚ ⫰*[i2] f2 ≘ f → f2 ⊚ 𝐮❨i1❩ ≘ f.

. replace.sh . "/substitution/" "/unwind/"
. replace.sh . ↑ ▼ 

266D;MUSIC FLAT SIGN;So;0;ON;;;;;N;FLAT;;;;
266E;MUSIC NATURAL SIGN;So;0;ON;;;;;N;NATURAL;;;;
266F;MUSIC SHARP SIGN;Sm;0;ON;;;;;N;SHARP;;;;