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In page Black-letter law:

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The phrase is nearly synonymous with the phrase "hornbook law".[citation needed] There are a number of venerable legal sources that distill the common law on various subjects known as restatement of the Law. The specific titles will be "The Restatement (First) of Contracts" or "The Restatement of Agency", etc. Each of these volumes is divided into sections that begin with a text in boldface that summarizes a basic rule on an aspect of the law of contracts, agency, etc. This "restatement" is followed by commentary and examples that expand on the principle stated.[citation needed]