6. Book Section 11.2 Problem 3 Suppose we need a DFA to recognize decimal representations of rational numbers with no repeating decimal patterns. We can represent the strings by the following regular expression, where d represents a decimal digit and the vertical line "I" denotes the usual + for regular expressions, since + is now used as the arithmetic plus sign: Find a DFA for this regular expression. Note that + has a new meaning here unlike in other problems we solved. 7. Construct an NFA for the regular expression ab+ba 8. Construct an NFA for the regular expression b(ab+bb+c)+abc 9. Boo Section 11.2 Problem 6b Construct an NFA for the regular expression ab