Given the task definition and input, reply with output. 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'.

Context: the islands played a small role in the Bering Sea Arbitration Link Information: The sittings of the tribunal began in February 1893 and ended in August. Question: How long did the arbitration in which the islands played a small role last?
Answer: 6