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.

Example Input: proper question: What can't work to even the distribution of wealth? 
 disfluent question: What can no can't work to even the progressive oops no distribution of wealth? 
 context: Another cause is the rate at which income is taxed coupled with the progressivity of the tax system. A progressive tax is a tax by which the tax rate increases as the taxable base amount increases. In a progressive tax system, the level of the top tax rate will often have a direct impact on the level of inequality within a society, either increasing it or decreasing it, provided that income does not change as a result of the change in tax regime. Additionally, steeper tax progressivity applied to social spending can result in a more equal distribution of income across the board. The difference between the Gini index for an income distribution before taxation and the Gini index after taxation is an indicator for the effects of such taxation.
Example Output: None

Example Input: proper question: How many years did it take for the Spring snow covers to melt? 
 disfluent question: When did no how many years did it take for the Spring snow covers to melt? 
 context: As northwest Europe slowly began to warm up from 22,000 years ago onward, frozen subsoil and expanded alpine glaciers began to thaw and fall-winter snow covers melted in spring. Much of the discharge was routed to the Rhine and its downstream extension. Rapid warming and changes of vegetation, to open forest, began about 13,000 BP. By 9000 BP, Europe was fully forested. With globally shrinking ice-cover, ocean water levels rose and the English Channel and North Sea re-inundated. Meltwater, adding to the ocean and land subsidence, drowned the former coasts of Europe transgressionally.
Example Output: None

Example Input: proper question: What letter didn't Washington present to Saint-Pierre ? 
 disfluent question: What letter didn't Marin no Washington present to Saint-Pierre? 
 context: Jacques Legardeur de Saint-Pierre, who succeeded Marin as commander of the French forces after the latter died on October 29, invited Washington to dine with him. Over dinner, Washington presented Saint-Pierre with the letter from Dinwiddie demanding an immediate French withdrawal from the Ohio Country. Saint-Pierre said, As to the Summons you send me to retire, I do not think myself obliged to obey it. He told Washington that France's claim to the region was superior to that of the British, since René-Robert Cavelier, Sieur de La Salle had explored the Ohio Country nearly a century earlier.
Example Output:
None