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Automaton for 'almost' same word in language

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Problem Detail: 

I have some finite language L, which is regular.

I want to find a finite automaton (DFA/NFA) that for every word w in L, it accepts any word with the same length but only with 1 char diffrence.

I thought about maybe accept DFA for L, because it a regular language and think about an NFA solution, but my problem is those possible "circles" in the automata..

Any idea?

Asked By : Ori Refael
Answered By : Ran G.

Main Idea:
Construct two copies of the DFA for $L$. The first copy will be connected to the second copy by moves that will allow the "difference" of a single letter. For example, if $q_1$ and $q_2$ are connected by a $0$-move in the original DFA, then $q_1$ in the first copy will be connected to $q_2$ in the second copy by a $1$-move.

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Question Source : http://cs.stackexchange.com/questions/49652

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