TASK DEFINITION: In this task, you're given a passage, 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'.
PROBLEM: Passage: To promote I Am... Sasha Fierce, Beyoncé embarked on the I Am... World Tour with several performances. The tour kicked off in Edmonton, Alberta, Canada on March 26, 2009, in support of the album. The European leg of the tour started on April 26, 2009, in Zagreb, Croatia and ended on June 9, 2009, in London, England. On June 21, 2009, she began the third leg of the tour in the United States and finished in August with a four-day stint at Encore Las Vegas on the Las Vegas Strip. Starting on September 15, 2009, the fourth leg began in Melbourne, Australia and finished on September 24 in Perth, Australia. Beyoncé then went on performing in Asia, the Middle East, Europe, Africa, and the United Kingdom, before finishing the 2009 portion of the tour on November 24 in Belfast, Northern Ireland. The tour had its final leg in 2010, visiting Latin America. Starting on February 4, 2010, in Florianópolis, Brazil, she visited five other places before ending in Trinidad on February 18, 2010. According to Pollstar, the tour earned $17.2 million between January 1, and June 30, 2010, which added onto her total of $86 million for her first ninety-three concerts in 2009, bringing the tour total to $103.2 million for the ninety-seven shows.
 Link Information: The European leg of the tour started on April 26, 2009, in Zagreb, Croatia and ended on June 9, 2009, in London, England. Question: Is the city that hosted the first leg on the European leg of Beyonce's 2009 tour smaller or larger than the city that hosted the final stop on that tour?

SOLUTION: Answer: London

PROBLEM: Passage: Free-agent goaltender Jeff Hackett was signed from the Boston Bruins to replace Roman Cechmanek and challenge backup Robert Esche for the number one spot in 2003–04, but Hackett was forced to retire in February due to vertigo. During the course of the season, serious injuries suffered by both Jeremy Roenick (broken jaw) and Keith Primeau (concussion) in February forced the Flyers to trade for the Chicago Blackhawks' Alexei Zhamnov, who filled in well and kept the Flyers afloat. Esche entrenched himself as starter and remained in that position even after the Flyers re-acquired Sean Burke from the Phoenix Coyotes, as the Flyers clinched the Atlantic Division title over the New Jersey Devils on the last day of the season.
 Link Information: none Question: What are the symptoms of the condition that forced Hackett to retire?

SOLUTION: Answer: none

PROBLEM: Passage: It would seem that Gill's interests lay elsewhere since after a few years he sold the business, and then spent time equipping Lord Lindsay's private observatory at Dun Echt, Aberdeenshire. In 1874, Gill joined the expedition to Mauritius to observe the transit of Venus. Three years later he went to Ascension Island to observe a near approach of Mars and to calculate its distance. While carrying out these laborious calculations, he was notified of his appointment to the Cape Observatory, which, over the following 27 years he was to refurbish completely, turning it into a first-rate institution. Gill was a meticulous observer and had a flair for getting the best out of his instruments. His solar parallax observations with a heliometer and his calculations of distances to the nearer stars, are testimony to his outstanding work. He recruited Robert Innes to the Cape Observatory.
 Link Information: to Ascension Island to observe a near approach of Mars Question: Which of the places where Gill observed the planets has a larger population?

SOLUTION:
Answer: Mauritius