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3. Neither the President is happy nor is Congress placated; The President is not happy or Congress is placated.
4. (a) George will cut down a tree . (George will marry Martha ∨ George will die a bachelor)(b) (Abe will not become mayor . city will not prosper) ∨ (Abe will become mayor . Ava will become head of chamber of commerce)(c) (Steve escapes the country ∨ Steve befriends Sally)