prop_logic_puzzle / example_num_vars4_depth8 /puzzle_0cdefd3336fe8253.txt
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new ((B β†’ D) β†’ C) β†’ (A β†’ (D ∧ A β†’ ((C β†’ D) β†’ (C β†’ A))))
intro
intro
intro
cases 2
cases 2
intro
cases 2
intro
cases 2
exact 1