NO
0.09/0.17	NO
0.09/0.17	
0.09/0.17	Problem:
0.09/0.17	 and(true()) -> X
0.09/0.17	 if(true()) -> X
0.09/0.17	 if(false()) -> Y
0.09/0.17	 add(0()) -> X
0.09/0.17	 and(false()) -> false()
0.09/0.17	 add(s()) -> s()
0.09/0.17	 first(0(),X) -> nil()
0.09/0.17	 first(s(),cons()) -> cons()
0.09/0.17	 from() -> cons()
0.09/0.17	
0.09/0.17	Proof:
0.09/0.17	 Fresh Variable Processor:
0.09/0.17	  loop length: 1
0.09/0.17	  terms:
0.09/0.17	   and(true())
0.09/0.17	  context: []
0.09/0.17	  substitution:
0.09/0.17	   X -> and(true())
0.09/0.17	  Qed
0.09/0.17	EOF