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: In October 1952, fighting around the Red River Delta spread into the Thai Highlands, resulting in the Battle of Na San Link Information:

The Burma campaign was a series of battles fought in the British colony of Burma, South-East Asian theatre of World War II Question: How many years were there between the end of the British Burma Campaign and the start of the Battle of Na San?
Answer: 7