prop_logic_puzzle / example_num_vars4_depth9 /puzzle_4d920c625de613ba.txt
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new C ∨ D → (B ∨ C → (A ∧ A → A ∧ (A ∨ (D ∨ A) → A ∨ D)))
intro
intro
intro
cases 2
cases 2
constructor
exact 3
intro
cases 2
left
exact 3