prop_logic_puzzle / example_num_vars4_depth8 /puzzle_0539b8254cf3416e.txt
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new B ∧ D → (A ∧ B → A) ∨ (D ∧ D ∨ (D → A)) ∧ (B ∨ (D → B))
intro
cases 0
cases 0
left
intro
cases 5
cases 0
cases 5
exact 6