Question: Construct DFAs for the following languages: The set of strings over { a , b } such that the fourth symbol from the right is

Construct DFAs for the following languages:
The set of strings over {a, b} such that the fourth symbol from the right is 'a'.
Please make sure to explain everything, then draw the DFA (there should be circles and arrows with both being labeled - either hand draw or draw digitally (do NOT just type it with text arrows like 'q1-->q2'). Make sure that it is a DFA (not just NFA).

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