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: "where is area code 931 located in usa?" whose answer is Middle Tennessee.
Each document should contain about 30 words, and these documents should contain useful information.

Query: location of area code 931
Useful Output:

Doc 1: Area code 931 covers the Middle Tennessee area from north to south though it does include the greater Nashville area.
Doc 2: Area Code 931 is located in Tennessee. It covers 108 cities, including Clarksville, Spring Hill, Columbia, Cookeville, and Shelbyville. It also covers 37
Doc 3: Area code 931 is in Tennessee, USA , spanning 29 counties and serving 136 cities , including Clarksville, Spring Hill or Columbia; it currently uses 525
Doc 4: Area code 931 is the area code for most of central Tennessee surrounding the Nashville metro area. It includes the cities of Clarksville, Columbia, and
Doc 5: Area code/prefix search ; 931-506, A, McMinnville ; 931-507, A, McMinnville Rural ; 931-510, A, Cookeville ; 931-516, A, Cumberland City