Clear Lakes Trout Co. operates a fish hatchery in Idaho. Rodney and Carla Griffith are trout growers. Clear Lakes agreed to sell “small trout” to the Griffiths, who agreed to sell the trout back when they had grown to “market size.” At the time, in the trade “market size” referred to fish approximating one-pound live weight. The parties did business without a written agreement until September 1998 when they executed a contract with a six-year duration. The contract did not define “market size.” All went well until September 11, 2001, after which there was a demand for larger fish. Clear Lakes began taking deliveries later and in smaller loads, leaving the Griffiths with overcrowded ponds and other problems. In 2003, the Griffiths refused to accept more fish and filed a suit in an Idaho state court against Clear Lakes, alleging breach of contract. Clear Lakes argued that there was no contract because the parties had different interpretations of “market size.” Clear Lakes claimed that “market size” varied according to whatever its customers demanded. The Griffiths asserted that the term referred to fish of about one-pound live weight. Is outside evidence admissible to explain the terms of a contract? Are there any exceptions that could apply in this case? If so, what is the likely result? Explain.