new C → (F ∧ C → (A ∨ E → (F ∧ E → ((F ∨ C → B) → (F → A ∧ B ∨ ((E ∧ F → (B → C)) ∧ ((E → C) ∨ A)) ∧ (D → E))))))
intro
intro
cases 1
intro
intro
cases 5
intro
intro
cases 1
cases 5
right
constructor
constructor
intro
cases 14
cases 1
cases 5
cases 14
intro
cases 1
cases 5
cases 14
exact 0
left
intro
cases 1
cases 5
exact 0
intro
cases 1
cases 5
exact 7