intro res ress_in_ress ℓ ℓ_in_res
Lcond Rcond : Finset Formula
ress : List SubPair
rule : LocalRule (Lcond, Rcond) ress
⊢ ∀ res ∈ ress, voc res.1 ⊆ voc Lcond
Lcond Rcond : Finset Formula
ress : List SubPair
rule : LocalRule (Lcond, Rcond) ress
res : SubPair
ress_in_ress : res ∈ ress
ℓ : Char
ℓ_in_res : ℓ ∈ voc res.1
⊢ ℓ ∈ voc Lcond