instruction:
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'.
question:
Context: A more powerful engine was added to the second prototype, and a single 7.92 mm (.312 in) MG 15 machine gun for the rear seat was added to the third prototype. Link Information: he World War II MG 15 was used in nearly all Luftwaffe aircraft with a flexible-mount defensive position. Question: What other planes were fitted with the MG 15?
answer:
Answer: nearly all Luftwaffe aircraft with a flexible-mount defensive position


question:
Context: He rose through the ranks and has served as a member of UPDF delegation during the ill-fated Juba Peace Talks, at the rank of lieutenant colonel. Link Information: none Question: What year did Innocnet Oula participate in the Juba Peace Talks?
answer:
Answer: none


question:
Context: Along this line, Fritz Zwicky proposed a "tired light" mechanism in 1929. Link Information: 

Fritz Zwicky (; ; February 14, 1898  Question: How old was the man that proposed a "tired light" mechanism?
answer:

Answer: 31