prop_logic_puzzle / example_num_vars4_depth6 /puzzle_3490c9f3b9ed6521.txt
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new (B β†’ D ∧ D) β†’ (C ∨ D β†’ (D ∧ C β†’ (C ∨ B β†’ ((B β†’ B) ∧ C) ∧ D)))
intro
intro
intro
cases 2
intro
cases 2
constructor
constructor
intro
cases 2
exact 8
exact 4
exact 3