prop_logic_puzzle / example_num_vars5_depth8 /puzzle_2bc109870133d730.txt
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new (B ∨ C β†’ B) β†’ (E ∧ B β†’ ((E β†’ D) β†’ E ∨ (B ∨ D)))
intro
intro
cases 1
intro
cases 1
left
exact 2