I believe that $$D = \{w: w \text{ has an equal number of occurrences of the 01 and 10 ranges}\}$$ is regular but can not create regular expression or DFA or NDFA.
Can I have a help.
2026-03-27 19:31:00.1774639860
Is the following language regular?
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Hint: When you have seen a substring $01$, every subsequent occurrence of $1$ will not increase the number of substrings of the form $10$, but an occurrence of $0$ will. Likewise, when you see a substring $10$, every subsequent occurrence of $0$ will not increase the number of substrings of the form $01$, but an occurrence of $1$ will.