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.

Ex Input:
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.

Ex Output:
None


Ex Input:
proper question: What do the CBSE and the CISCe both have the power to govern? 
 disfluent question: What do the CBSE and the CISCe both have the finances uh alternatively the power to govern? 
 context: In India, private schools are called independent schools, but since some private schools receive financial aid from the government, it can be an aided or an unaided school. So, in a strict sense, a private school is an unaided independent school. For the purpose of this definition, only receipt of financial aid is considered, not land purchased from the government at a subsidized rate. It is within the power of both the union government and the state governments to govern schools since Education appears in the Concurrent list of legislative subjects in the constitution. The practice has been for the union government to provide the broad policy directions while the states create their own rules and regulations for the administration of the sector. Among other things, this has also resulted in 30 different Examination Boards or academic authorities that conduct examinations for school leaving certificates. Prominent Examination Boards that are present in multiple states are the CBSE and the CISCE, NENBSE

Ex Output:
None


Ex Input:
proper question: What is the parliamentary mace made of? 
 disfluent question: What is the formal ceremonial role no the parliamentary mace made of? 
 context: In front of the Presiding Officers' desk is the parliamentary mace, which is made from silver and inlaid with gold panned from Scottish rivers and inscribed with the words: Wisdom, Compassion, Justice and Integrity. The words There shall be a Scottish Parliament, which are the first words of the Scotland Act, are inscribed around the head of the mace, which has a formal ceremonial role in the meetings of Parliament, reinforcing the authority of the Parliament in its ability to make laws. Presented to the Scottish Parliament by the Queen upon its official opening in July 1999, the mace is displayed in a glass case suspended from the lid. At the beginning of each sitting in the chamber, the lid of the case is rotated so that the mace is above the glass, to symbolise that a full meeting of the Parliament is taking place.

Ex Output:

silver