If one of the alternative acts required by an obligation is such as the law will not enforce or becomes unlawful or impossible of performance, the obligation is to be interpreted as though the other or others stood alone.
Mont. Code Ann. § 28-1-504
When obligation to be interpreted as though a particular alternative did not exist
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.