obtain ⟨_, _, e⟩ := hFour
case hMaxm.inl.inr
α : Type u_1
inst✝ : DecidableEq α
p : Formula α
hFour : p ∈ 𝟰
⊢ 𝐆𝐋 ⊢! p
case hMaxm.inl.inr.intro.refl
α : Type u_1
inst✝ : DecidableEq α
w✝ : Formula α
⊢ 𝐆𝐋 ⊢! Axioms.Four w✝