(VAR X Y Z X1)
(STRATEGY CONTEXTSENSITIVE 
  (2nd 1)
  (cons 1)
  (from 1)
  (s 1)
  (cons1 1 2)
)
(RULES 
2nd(cons1(X,cons(Y,Z))) -> Y
2nd(cons(X,X1)) -> 2nd(cons1(X,X1))
from(X) -> cons(X,from(s(X)))
)