4. (12 points) An FA illustrating a simplified version of lexical analysis in the right figure. We have the following configurations: D is any digit; L is a lowercase letter other than p or i; M is D or Li; N is D or L or p or i; Answer the following questions: a) Describe tokens accepted at state 3 and state 4; b) Describe tokens accepted at state 5 ; c) Describe tokens accepted at state 6 and 7..