(VAR X Y Z)
(RULES 
sel(s(X),cons(Y)) -> sel(X,Z)
sel(0,cons(X)) -> X
first(0,Z) -> nil
first(s(X),cons(Y)) -> cons(Y)
from(X) -> cons(X)
sel1(s(X),cons(Y)) -> sel1(X,Z)
sel1(0,cons(X)) -> quote
first1(0,Z) -> nil1
first1(s(X),cons(Y)) -> cons1(quote,first1(X,Z))
quote -> 01
quote1 -> cons1(quote,quote1)
quote1 -> nil1
quote -> s1(quote)
quote -> sel1(X,Z)
quote1 -> first1(X,Z)
unquote(01) -> 0
unquote(s1(X)) -> s(unquote(X))
unquote1(nil1) -> nil
unquote1(cons1(X,Z)) -> fcons(unquote(X),unquote1(Z))
fcons(X,Z) -> cons(X)
)