new B ∧ C → (B ∨ H → (G ∧ D → (F ∨ H → ((D → D) → G) ∧ (H → H ∨ A) ∨ E)))
intro
cases 0
intro
intro
cases 4
intro
cases 0
cases 4
left
constructor
intro
cases 0
cases 4
exact 5
intro
cases 0
cases 4
left
exact 17