Question: [ 2 0 pts ] Given a DFA D , we consider the problem whether it accepts ALL strings where any two adjacent characters are

[20 pts] Given a DFA D, we consider the problem whether it accepts ALL strings where any two adjacent characters are different (such as 0,1,01,10,010,101, etc), formulate this problem as a language, denote it as . Prove that is decidable.

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