MAYBE
43.72/12.16	MAYBE
43.72/12.16	
43.72/12.16	Problem:
43.72/12.16	 f(x,f(y,a())) -> h(f(a(),f(f(x,a()),y)))
43.72/12.16	
43.72/12.16	Proof:
43.72/12.16	 Open
43.72/12.16	EOF