Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Context: his contract was terminated by mutual consent on 30 August 2007. Link Information: his contract was terminated by mutual consent on 30 August 2007 Question: How long had Terry Butcher been the manager for Brentford F.C. when Brooker's contract was terminated?
Output:
Answer: 6