prop_logic_puzzle / example_num_vars5_depth8 /puzzle_6c6cc1047bb2f8f3.txt
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new E ∧ B β†’ ((E ∨ D β†’ C) β†’ (B ∧ E β†’ (A ∨ B β†’ (C ∧ A β†’ (B β†’ (B β†’ B ∨ E))))))
intro
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left
exact 2