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A contract can only be enforced up to the quantity shown in the writing. RCW 62A.2-201(1), (3), Alaska Independent Fishermens Mktg. Ass'n v. New England Fish Co., 15 Wn. App. 154, 157, 548 P.2d 348 (1976). II E. Allan Farnsworth, Contracts §§ 6.7 n. 44, 6.2 n. 22-24 (1990); RCW 62A.2-201(1); see also RCW 62A.2-201(3)(b); and U.C.C. § 2-209, comment 3 (an authenticated 'memo is limited in its effect to the quantity of goods set forth in it').  

 'Where the writing relied upon to form the contract of sale is totally silent as to quantity, parol evidence cannot be ...