MAYBE
90.93/43.51	MAYBE
90.93/43.51	
90.93/43.51	Problem:
90.93/43.51	 a(x1) -> b(x1)
90.93/43.51	 a(c(x1)) -> c(c(a(b(x1))))
90.93/43.51	 b(b(x1)) -> a(x1)
90.93/43.51	
90.93/43.51	Proof:
90.93/43.51	 Open
90.93/43.52	EOF