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 broadnose sevengill shark (Notorynchus cepedianus) is known to prey on the crossback stingaree Link Information: It is recognizable because of its seven gill slits, while most shark species have five gill slits Question: What is the difference between the amount of gills the species known to prey on the crossback stingaree have compared to most shark species?
Answer: 2

Context: On April 25, 1864, Gordon led his regiment at the Battle of Marks' Mills Link Information: none Question: Which city had a greater population the year Gordon led his regiment to the Battle of Marks' Mills, Little Rock or Camden?
Answer: none

Context: In 1979 he moved to Alberta Link Information: none Question: Which had a larger population the year Fraser moved to Alberta, Ottawa or Vancouver?

Answer: none