748.69/299.38	MAYBE
748.69/299.38	
748.69/299.38	Problem:
748.69/299.38	 strict:
748.69/299.38	  c(b(a(x1))) -> b(a(a(x1)))
748.69/299.38	  a(a(c(x1))) -> c(b(a(x1)))
748.69/299.38	 weak:
748.69/299.38	  b(c(b(x1))) -> b(c(a(x1)))
748.69/299.38	  b(a(b(x1))) -> a(b(c(x1)))
748.69/299.38	  c(a(b(x1))) -> b(a(a(x1)))
748.69/299.38	  a(a(c(x1))) -> b(b(c(x1)))
748.69/299.38	
748.69/299.38	Proof:
748.69/299.38	 Open
748.69/299.39	EOF