prop_logic_puzzle / example_num_vars4_depth8 /puzzle_25dea072e9ed4dc3.txt
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new (B β†’ D) β†’ ((A β†’ B) β†’ (A ∧ D β†’ (B ∧ A β†’ D) ∨ C))
intro
intro
intro
cases 2
cases 2
left
intro
cases 7
cases 2
cases 7
exact 4