MAYBE
50.31/20.40	MAYBE
50.31/20.40	
50.31/20.40	Problem:
50.31/20.40	 a(x1) -> x1
50.31/20.40	 a(b(a(b(x1)))) -> c(b(c(x1)))
50.31/20.40	 c(x1) -> b(a(a(x1)))
50.31/20.40	
50.31/20.40	Proof:
50.31/20.40	 Open
50.31/20.40	EOF