Question: Show that the language A = { | R is a regular expression and there is at least one string w in L ( R

Show that the language A ={| R is a regular expression and there is at least one string w in L(R) such that w has 00101 as a substring (that is, w = x00101y for some strings x and y)} is decidable. 2. Show that the language L ={| M is a TM that accepts all strings of length 5} is undecidable.

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