Use a disfluent question or a proper question and find the answer to the question based on the given context or return None if an answer can't be found. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

proper question: Who created ARPANET in the United States? 
 disfluent question: Who created RAND er uh ARPANET in the United States? 
 context: Starting in the late 1950s, American computer scientist Paul Baran developed the concept Distributed Adaptive Message Block Switching with the goal to provide a fault-tolerant, efficient routing method for telecommunication messages as part of a research program at the RAND Corporation, funded by the US Department of Defense. This concept contrasted and contradicted the theretofore established principles of pre-allocation of network bandwidth, largely fortified by the development of telecommunications in the Bell System. The new concept found little resonance among network implementers until the independent work of Donald Davies at the National Physical Laboratory (United Kingdom) (NPL) in the late 1960s. Davies is credited with coining the modern name packet switching and inspiring numerous packet switching networks in Europe in the decade following, including the incorporation of the concept in the early ARPANET in the United States.
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proper question: What forces can be modeled using ideal friction strings? 
 disfluent question: What do er uh what forces can be modeled using ideal friction strings? 
 context: Tension forces can be modeled using ideal strings that are massless, frictionless, unbreakable, and unstretchable. They can be combined with ideal pulleys, which allow ideal strings to switch physical direction. Ideal strings transmit tension forces instantaneously in action-reaction pairs so that if two objects are connected by an ideal string, any force directed along the string by the first object is accompanied by a force directed along the string in the opposite direction by the second object. By connecting the same string multiple times to the same object through the use of a set-up that uses movable pulleys, the tension force on a load can be multiplied. For every string that acts on a load, another factor of the tension force in the string acts on the load. However, even though such machines allow for an increase in force, there is a corresponding increase in the length of string that must be displaced in order to move the load. These tandem effects result ultimately in the conservation of mechanical energy since the work done on the load is the same no matter how complicated the machine.
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proper question: How much of the student population went to private schools in 1984? 
 disfluent question: How much of the student population went to private schools in 1979, sorry, 1984? 
 context: As of April 2014, there are 88 private schools in New Zealand, catering for around 28,000 students or 3.7% of the entire student population. Private school numbers have been in decline since the mid-1970s as a result of many private schools opting to become state-integrated schools, mostly due of financial difficulties stemming from changes in student numbers and/or the economy. State-integrated schools keep their private school special character and receives state funds in return for having to operate like a state school, e.g. they must teach the state curriculum, they must employ registered teachers, and they can't charge tuition fees (they can charge attendance dues for the upkeep on the still-private school land and buildings). The largest decline in private school numbers occurred between 1979 and 1984, when the nation's then-private Catholic school system integrated. As a result, private schools in New Zealand are now largely restricted to the largest cities (Auckland, Hamilton, Wellington and Christchurch) and niche markets.

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