prop_logic_puzzle / example_num_vars6_depth10 /puzzle_2294aadebff5e9f0.txt
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new (F β†’ A) β†’ (E ∨ B β†’ (B β†’ ((D ∨ E β†’ C) β†’ (D ∧ A β†’ B ∨ (B ∨ F)))))
intro
intro
intro
intro
intro
cases 4
cases 4
left
exact 2