prop_logic_puzzle / example_num_vars6_depth11 /puzzle_5d17f190632bc1bc.txt
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new C β†’ ((D β†’ A) β†’ (A ∧ B β†’ (B β†’ (A ∧ C β†’ C ∨ (D ∨ B)))))
intro
intro
intro
cases 2
intro
intro
cases 6
cases 2
cases 6
left
exact 0