197.97/50.74	MAYBE
197.97/50.74	
197.97/50.74	Problem:
197.97/50.74	 a(l(x1)) -> l(a(x1))
197.97/50.74	 r(a(x1)) -> a(r(x1))
197.97/50.74	 b(l(x1)) -> b(a(r(x1)))
197.97/50.74	 r(b(x1)) -> l(b(x1))
197.97/50.74	
197.97/50.74	Proof:
197.97/50.74	 Open
197.97/50.74	EOF