prop_logic_puzzle / example_num_vars4_depth8 /puzzle_949f7e0dcfcee960.txt
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new B β†’ (((D β†’ C) β†’ B) β†’ (B ∧ D β†’ ((A β†’ C ∨ D) ∨ (D ∨ B β†’ D) β†’ (C β†’ (C β†’ C))) ∨ D))
intro
intro
intro
cases 2
cases 2
left
intro
cases 2
intro
cases 2
intro
cases 2
exact 10