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'.

Ex Input:
Passage: The Yardbirds are an English blues rock band from London. Formed in May 1963, the group originally included lead vocalist Keith Relf, lead guitarist Anthony "Top" Topham, rhythm guitarist Chris Dreja, bassist Paul Samwell-Smith and drummer Jim McCarty. In October, Topham was replaced by Eric Clapton. He remained until 13 March 1965, when he left due to creative disagreements. Clapton recommended Jimmy Page to replace him, but he declined and Jeff Beck took over. Page later joined on bass the following June, after Samwell-Smith abruptly quit; Dreja later took over the role, allowing Page to join Beck on guitar. This lineup was short-lived, however, as Beck left in November 1966. The group continued as a four-piece until July 1968, when Relf and McCarty left due to creative differences, primarily with Page. Dreja initially remained, but by August Page formed a new group with vocalist Robert Plant, bassist John Paul Jones and drummer John Bonham, who later renamed themselves Led Zeppelin.
Link Information: who later renamed themselves Led Zeppelin. Question: In what year did the Yardbirds rename themselves Led Zeppelin?

Ex Output:
Answer: 1968

Ex Input:
Passage: The government of the Electorate of Hesse (Kurhessen) had begun building the FrankfurtBebra railway from Bebra in North Hesse to Fulda, Hanau and Frankfurt before its annexation by Prussia after the Austro-Prussian War of 1866. The project was completed by the Prussian state railways on 15 December 1868. Until the opening of the line south of the Main, trains from Bebra to Frankfurt had to use the North Main line and the Frankfurt City Link Line. On 15 November 1873 the new line south of the Main between Hanau and Frankfurt via Sachsenhausen and Offenbach was opened, including South Station (opened as Bebraer Bahnhof, "Bebra line" station) and Offenbach Hauptbahnhof. The South Main line is still the most important rail link connecting Frankfurt with Leipzig, Berlin and Hamburg.
Link Information: The Austro-Prussian War or Seven Weeks' War Question: How many months did the war that preceded the building of the Frankfurt-Bebra railway last?

Ex Output:
Answer: 2

Ex Input:
Passage: Corry cleared Bermuda on 25 October 1942 for Casablanca to participate in the Moroccan landings, in the screen of the aircraft carrier . She left Casablanca 16 November for Norfolk and Boston, and after overhaul resumed her coastal and Caribbean operations until 13 February 1943, when she sailed on escort duty from Norfolk for north Africa, returning 6 March for operations in the western Atlantic. On 11 August she sailed for Scotland and operated with the British Home Fleet, cruising once to Norway as providing escort for Ranger in the successful Allied air raid on Bod, Norway in October 1943 (Operation Leader). Corry sailed twice to Iceland to cover the movement of Russia-bound convoys. Returning to Boston on 3 December, Corry sailed on 24 December for escort duty to New Orleans and Panama.
Link Information: Corry cleared Bermuda on 25 October 1942 for Casablanca Question: What is the population of the city USS Corry went to in October of 1942?

Ex Output:
Answer: 3.35