Big problem with this NFA into DFA :((

From: FlicK (zeldino_at_hotmail.com)
Date: 02/05/04 

Date: Thu, 05 Feb 2004 16:09:08 GMT

I have big problem with this NFA:

Start with --a-- or --b-- in loop then read --bba--, then read --a--
or --b-- in loop and at the end read --b-- and the NFA accept.

(a+b)* bba (a+b)* b (is it correct this Regular Expression?)

but continue with: OR read --a-- and accept for ODD

What is the regular expression for this?

This is the problem: I must separate into two NFA? or in a unique NFA?
The subset construction is very hard :( Please help :((

Thank you!

P.S. a^2n+1 b^n is this Context Free Grammar correct?

S --> ASB | aaa
A --> a
B --> b

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