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Problem
#113152

Automata and Computability

Let A = (attached)   | R is a regular expression describing a language containing at least one string w that has 111 as a substring (i.e., w = x111y for some x and y)}.  Show that A is decidable.

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Problem A116.doc
Problem 16

| R is a regular expression describing a language containing at least
one string w that has 111 as a substring (i.e., w = x111y for some x and
y)}. Show that A is decidable.
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