cases orule <;> aesop
Rcond : Finset Formula
res : SubPair
ℓ : Char
ℓ_in_res : ℓ ∈ voc res.2
ress : List (Finset Formula)
orule : OneSidedLocalRule Rcond ress
ress_in_ress : res ∈ List.map (fun res => (∅, res)) ress
⊢ ℓ ∈ voc Rcond
no goals