new E ∧ C → (B → (((C ∨ D ∧ A) ∨ E) ∧ (((A ∨ E) ∧ C) ∧ (A ∨ (G ∨ A))) → ((A ∧ D) ∧ F → C ∨ B)) ∨ (A → (C ∧ C) ∧ B) ∧ (A → C))
intro
cases 0
intro
cases 0
left
intro
cases 6
cases 0
cases 6
cases 8
cases 12
cases 13
cases 15
intro
cases 21
cases 0
cases 6
cases 8
cases 12
cases 13
cases 15
cases 21
cases 22
cases 27
cases 28
cases 30
cases 36
cases 40
left
exact 2