NO
0.07/0.18	NO
0.07/0.18	
0.07/0.18	Problem:
0.07/0.18	 and(true()) -> X
0.07/0.18	 if(true()) -> X
0.07/0.18	 if(false()) -> Y
0.07/0.18	 add(0()) -> X
0.07/0.18	 and(false()) -> false()
0.07/0.18	 add(s()) -> s()
0.07/0.18	 first(0(),X) -> nil()
0.07/0.18	 first(s(),cons()) -> cons()
0.07/0.18	 from() -> cons()
0.07/0.18	
0.07/0.18	Proof:
0.07/0.18	 Fresh Variable Processor:
0.07/0.18	  loop length: 1
0.07/0.18	  terms:
0.07/0.18	   and(true())
0.07/0.18	  context: []
0.07/0.18	  substitution:
0.07/0.18	   X -> and(true())
0.07/0.18	  Qed
0.07/0.18	EOF