prop_logic_puzzle / example_num_vars10_depth6 /puzzle_47bee5627cb2a853.txt
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new (H β†’ E ∧ E) β†’ (A ∧ B β†’ ((F β†’ I ∧ I) β†’ ((A β†’ F) β†’ F ∨ (G ∨ E) ∧ (E ∨ D))))
intro
intro
cases 1
intro
intro
cases 1
left
apply 5
exact 2