prop_logic_puzzle / example_num_vars6_depth11 /puzzle_8aa9f9a284bc2cb8.txt
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new E ∧ D β†’ (D ∧ A β†’ (E β†’ A ∨ B) ∨ ((B β†’ A) ∨ B β†’ (E β†’ C)))
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cases 3
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cases 0
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exact 5