prop_logic_puzzle / example_num_vars4_depth9 /puzzle_76711aed7352ce04.txt
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new D ∧ A → ((C → A) → ((D ∧ D) ∧ (B ∨ B) → A)) ∧ D
intro
cases 0
cases 0
constructor
intro
cases 0
intro
cases 8
cases 0
cases 8
cases 9
cases 13
exact 2
exact 1