prop_logic_puzzle / example_num_vars6_depth11 /puzzle_b927d079c8a0d6d7.txt
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new ((C β†’ E) β†’ F) β†’ (F β†’ (((B β†’ E) β†’ A) β†’ ((F ∨ A) ∧ (B ∧ D) β†’ (D β†’ ((D β†’ E) β†’ E)))))
intro
intro
intro
intro
cases 3
intro
intro
cases 3
cases 5
cases 9
apply 7
exact 6