Input: Read this: In October 2013, the company announced the "Save a Page" feature which allows any Internet user to archive the contents of a URL. This became a threat of abuse by the service for hosting malicious binaries.
Question: When was a URL available?

Output: unanswerable


Input: Read this: However, by the turn of the 1990s the downward trend was starting to reverse; England had been successful in the 1990 FIFA World Cup, reaching the semi-finals. UEFA, European football's governing body, lifted the five-year ban on English clubs playing in European competitions in 1990 (resulting in Manchester United lifting the UEFA Cup Winners' Cup in 1991) and the Taylor Report on stadium safety standards, which proposed expensive upgrades to create all-seater stadiums in the aftermath of the Hillsborough disaster, was published in January of that year.
Question: In which year did the Premier League live the five year ban on English clubs?

Output: unanswerable


Input: Read this: However, from 1971 to 1975, NBA teams played preseason exhibitions against American Basketball Association teams. In the early days of the NBA, league clubs sometimes challenged the legendary barnstorming Harlem Globetrotters, with mixed success. The NBA has played preseason games in Europe and Asia. In the 2006 and 2007 seasons, the NBA and the primary European club competition, the Euroleague, conducted a preseason tournament featuring two NBA teams and the finalists from that year's Euroleague.[citation needed] In the 1998-99 and 2011-12 seasons, teams were limited to only two preseason games due to lockouts.
Question: What two seasons in the NBA not playing Europe and Asia?

Output: unanswerable


Input: Read this: Hokkien originated from Quanzhou. After the Opium War in 1842, Xiamen (Amoy) became one of the major treaty ports to be opened for trade with the outside world. From mid-19th century onwards, Xiamen slowly developed to become the political and economical center of the Hokkien-speaking region in China. This caused Amoy dialect to gradually replace the position of dialect variants from Quanzhou and Zhangzhou. From mid-19th century until the end of World War II, western diplomats usually learned Amoy Hokkien as the preferred dialect if they were to communicate with the Hokkien-speaking populace in China or South-East Asia. In the 1940s and 1950s, Taiwan also held Amoy Hokkien as its standard and tended to incline itself towards Amoy dialect.
Question: After the 1940's and 1950's Opium War, what became a major treaty port?

Output:
unanswerable