exact .inl ⟨h.symm, rfl⟩
case base
nfa : NFA
i l : ℕ
cs : List Char
c✝ : Char
start : ℕ
path : nfa.pathIn start i l (cs ++ [c✝])
cs₁ cs₂ : List Char
c : Char
h : cs₁ ++ [c] = cs₂
⊢ cs₂ = cs₁ ++ [c] ∧ [] = [] ∨ ∃ cs₃', cs₁ = cs₂ ++ cs₃' ∧ [] = cs₃' ++ [c]
no goals