(VAR X Y Z)
(STRATEGY CONTEXTSENSITIVE 
  (and 1)
  (true)
  (false)
  (if 1)
  (add 1)
  (0)
  (s)
  (first 1 2)
  (nil)
  (cons)
  (from)
)
(RULES 
and(true,X) -> X
and(false,Y) -> false
if(true,X,Y) -> X
if(false,X,Y) -> Y
add(0,X) -> X
add(s(X),Y) -> s(add(X,Y))
first(0,X) -> nil
first(s(X),cons(Y,Z)) -> cons(Y,first(X,Z))
from(X) -> cons(X,from(s(X)))
)