Exclusion of oral evidence preserves a written document's expressed terms and bars external facts to fix ambiguity or defects.

Section 96 bars oral or extrinsic evidence to explain, amend, or supply defects in a document whose language is on its face ambiguous or defective, preserving the primacy of the written terms; illustrations include conflicting monetary terms in an agreement and blanks in a deed, where surrounding facts or testimony may not be used to resolve the ambiguity or fill the blanks.

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