Cagney and Lacey enter into a written contract to open a bookstore specializing in detective novels. The written contract is a 2-paragraph handwritten document, and states that each party will receive 50% of any net profits and that each will devote 30 hours a week to the business. Both parties regard the writing as a final expression of their deal. After being in business for a while, Cagney sues Lacey for breach because Lacey is only working 20 hours per week during the summer months. Lacy attempts to present evidence that shows just prior to signing the contract, Cagney orally agreed that Lacey could work 20 hours a week when her children were on vacation from school. Will Lacey be able to present this evidence at trial?