Two cities are building bicycle paths. Charles City has built 5 km of bicycle paths by the end of the first month, and the total
length of the paths doubles each month. Tinsel Town has built 21 km of bicycle paths by the end of the first month, and the total length of the paths increases by 5 km per month. In which month will the total length of the bicycle paths in Charles City first exceed the length in Tinsel Town?
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