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 Frozen Ground was based on the crimes of which American serial killer?" whose answer is Robert Christian Hansen.
Each document should contain about 30 words, and these documents should contain useful information.

Query: "The Frozen Ground" serial killer
Useful Output:

Doc 1: The Frozen Ground (2013) "The Frozen Ground" is a 2013 crime thriller film directed by Scott Walker, based on the true story of Robert
Doc 2: The Frozen Ground follows Alaskan Sergeant, Jack Halcombe, as he sets out to end the murderous rampage of Robert Hansen, a serial killer who has gone unnoticed
Doc 3:  Nicolas Cage, Vanessa Hudgens, Kevin Dunn. Director Scott Walker. Trailers. The Frozen Ground. The Frozen Ground. Thriller. Related. Zodiac. In the Electric
Doc 4: Dir/scr: Scott Walker. US. 2013. 105mins. The Frozen Ground. A bleak and deliberately dour police procedural that follows the real-life
Doc 5: Cage told STV website: “The Frozen Ground was important to me. I felt like I was playing a real person, a hero. “Glenn Flothe was an Alaskan