. intro h; cases h; simp;
case mp
α : Type u_1
inst✝² : DecidableEq α
inst✝¹ : Inhabited α
𝓓 : DeductionParameter α
inst✝ : 𝓓.IncludeEFQ
t₁ t₂ : Tableau α
⊢ t₁ = t₂ → t₁.1 = t₂.1 ∧ t₁.2 = t₂.2

case mpr
α : Type u_1
inst✝² : DecidableEq α
inst✝¹ : Inhabited α
𝓓 : DeductionParameter α
inst✝ : 𝓓.IncludeEFQ
t₁ t₂ : Tableau α
⊢ t₁.1 = t₂.1 ∧ t₁.2 = t₂.2 → t₁ = t₂
case mpr
α : Type u_1
inst✝² : DecidableEq α
inst✝¹ : Inhabited α
𝓓 : DeductionParameter α
inst✝ : 𝓓.IncludeEFQ
t₁ t₂ : Tableau α
⊢ t₁.1 = t₂.1 ∧ t₁.2 = t₂.2 → t₁ = t₂