In W.W.W. Associates, Inc. v. Giancontieri, 77 N.Y.2d 157, 565 N.Y.S.2d 440, the Court stated, a familiar and eminently sensible proposition of law is that, when parties set down their agreement in a clear, complete document, their writing should as a rule be enforced according to its terms. Evidence outside the four corners of the document as to what was really intended but unstated or misstated is generally inadmissible to add or vary the writing "." id. p. 443 In W.W.W. Associates, Inc. v. Giancontieri, "A familiar and eminently sensible proposition of law is that, when parties set down their agreement in a clear, complete document, their writing should as a rule be enforced according to its terms. Evidence outside the four corners of the document as to what was really intended but unstated or misstated is generally inadmissible to add to or vary the writing (see, e.g., Mercury Bay Boating Club v. San Diego Yacht Club, 76 NY2d 256, 269-270, 557 N.E.2d 87, 557 N.Y.S.2d 851; Judnick Realty Corp. v. 32 W. 32nd St. Corp., 61 NY2d 819, 822, 462 N.E.2d 131, 473 N.Y.S.2d 954; Long Is. R.R. Co. v. Northville Indus. Corp., 41 NY2d 455, 362 N.E.2d 558, 393 N.Y.S.2d 925; Oxford Commercial Corp. v. Landau, 12 NY2d 362, 365, 190 N.E.2d 230, 239 N.Y.S.2d 865)." Id. p. 162. The Court stated: "a familiar and eminently sensible proposition of law is that, when parties set down their agreement in a clear, complete document, their writing should as a rule be enforced according to its terms. Evidence outside the four corners of the document as to what was really intended but unstated or misstated is generally inadmissible to add to or vary the writing "." id. p. 443