prop_logic_puzzle / example_num_vars4_depth6 /puzzle_052901ebc795d33d.txt
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new (D ∨ B β†’ A) β†’ ((D β†’ C) β†’ (B ∧ D β†’ (((C β†’ A) β†’ A) β†’ D)))
intro
intro
intro
cases 2
intro
cases 2
exact 4