prop_logic_puzzle / example_num_vars4_depth6 /puzzle_7afd22fe8058b63f.txt
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new (C β†’ B) β†’ ((C β†’ A) β†’ (B ∧ D β†’ (A ∧ C β†’ D)))
intro
intro
intro
cases 2
intro
cases 5
cases 2
cases 5
exact 4