prop_logic_puzzle / example_num_vars4_depth9 /puzzle_193e8aa52deeede3.txt
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new (B β†’ D ∧ B) β†’ ((B ∨ D β†’ B) β†’ (A ∧ B β†’ (D ∧ D β†’ B) ∧ (D ∨ A)))
intro
intro
intro
cases 2
cases 2
constructor
intro
cases 7
cases 2
cases 7
exact 4
right
exact 3