You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What roman author described the technique of Opus quadratum?" whose answer is Vitruvius.
Each document should contain about 30 words, and these documents should contain useful information.

Query: roman author describing opus quadratum
Useful Output:

Doc 1: opus quadratum: Ashlar; squared stones laid in regular, horizontal courses. opus quasi reticulatum: This modern term has been coined to describe
Doc 2: A Roman consular army in 297 BC formed a solid square against the Samnites (Livy 10 13-14), then arrayed in battle order. So from start to
Doc 3: The former group consists of 18 original ASEs built using the techniques of opus quadratum and opus incertum (OASEs: the northwestern abutment,
Doc 4: Livy has not referred to saxum quadratum since describing the Sepulcrum Horatiae at 1.26.14. His earlier comments on the pomerium also
Doc 5: The Roman Opus Quadratum was always dry-fitted (without mortar). The size of the ashlars was variable depending on the monumentality with which the future