Some regular expression conversions from the examples:


b | ba | bbb*a | a | ab | aaa*b
	
	ba | bbb*a   ==>   b (a | bb*a)
				 ==>   b ((ε | bb*) a)
				 ==>   b (b* a)
				 ==>   bb*a

	ab | aaa*b   ==>   a (b | aa*b)
				 ==>   a ((ε | aa*) b)
				 ==>   a (a* b)
				 ==>   aa*b

b | bb*a | a | aa*b

    bb*a | a | aa*b | b

	bb*a | a     ==>   (bb* | ε) a
			 ==>   (ε | bb*) a
	             ==>   (b*) a
	             ==>   b*a

	aa*b | b     ==>   (aa* | ε) b
	             ==>   (ε | aa*) b
	             ==>   (a*) b
	             ==>   a*b