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Oct 14, 2019 at 2:56 comment added Breakpoint @YuvalFilmus I thought the op was asking dfa just for double-letter(L). Now that I re read the question, what you said makes sense.
Oct 14, 2019 at 0:02 comment added Mandy I was asking for a general way to construct a doubled language! that language I provided as example was just an example.
Oct 13, 2019 at 20:14 comment added Yuval Filmus Your DFA doesn't depend on $L$ at all.
Oct 13, 2019 at 19:46 history edited Breakpoint CC BY-SA 4.0
added 52 characters in body
Oct 13, 2019 at 19:13 history answered Breakpoint CC BY-SA 4.0