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: "The second largest convention center on its opening in 1990 is owned by what company?" whose answer is Las Vegas Sands Corporation.
Each document should contain about 30 words, and these documents should contain useful information.

Query: second largest convention center opened in 1990
Useful Output:

Doc 1:  second-largest convention center in the world. The Sands Expo in Las Vegas was launched by Sands Corporation in 1990, making it the only privately owned and
Doc 2: Address: 201 Sands Ave.  Date Opened: 1990 (at the time it was the second largest convention center in the U.S.—it's now fifth—and was the only
Doc 3: Salt Lake Ballroom  The Salt Lake Ballroom, our second largest, offers 14,689 square feet of space, accommodating up to 1,830 guests. It also comes with a
Doc 4: The Charlotte Convention Center, opened in 1995, attracts more than one-half million visitors annually. The facility is connected to NASCAR Hall
Doc 5: Savannah Convention Center ; Meeting rooms. 19 ; Second largest room. 171,778 sq. ft. ; Exhibit space. 100,000 sq. ft. ; Space (semi-private). 16,600 sq. ft. ; Space