prop_logic_puzzle / example_num_vars6_depth6 /puzzle_77caf38156ef79ff.txt
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new (F ∨ E β†’ F) β†’ ((E β†’ D) β†’ ((E β†’ C) β†’ ((F ∨ A) ∨ (D ∧ F β†’ F)) ∨ (D ∨ (A β†’ F) ∧ (A β†’ A))))
intro
intro
intro
left
right
intro
cases 3
cases 3
exact 5