prop_logic_puzzle / example_num_vars5_depth8 /puzzle_1cf8983eb42e4694.txt
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new (E ∨ B β†’ E) β†’ (E β†’ (E ∨ B β†’ ((E ∨ A β†’ D) β†’ (E β†’ (B ∧ C β†’ B) ∧ E))))
intro
intro
intro
intro
intro
constructor
intro
cases 5
cases 5
exact 6
exact 1