(VAR X X1 X2 Y Z )
(RULES 
        a__sel(s(X), cons(Y, Z)) -> a__sel(mark(X), mark(Z))
        a__sel(0, cons(X, Z)) -> mark(X)
        a__first(0, Z) -> nil
        a__first(s(X), cons(Y, Z)) -> cons(mark(Y), first(X, Z))
        a__from(X) -> cons(mark(X), from(s(X)))
        a__sel1(s(X), cons(Y, Z)) -> a__sel1(mark(X), mark(Z))
        a__sel1(0, cons(X, Z)) -> a__quote(X)
        a__first1(0, Z) -> nil1
        a__first1(s(X), cons(Y, Z)) -> cons1(a__quote(Y), a__first1(mark(X), mark(Z)))
        a__quote(0) -> 01
        a__quote1(cons(X, Z)) -> cons1(a__quote(X), a__quote1(Z))
        a__quote1(nil) -> nil1
        a__quote(s(X)) -> s1(a__quote(X))
        a__quote(sel(X, Z)) -> a__sel1(mark(X), mark(Z))
        a__quote1(first(X, Z)) -> a__first1(mark(X), mark(Z))
        a__unquote(01) -> 0
        a__unquote(s1(X)) -> s(a__unquote(mark(X)))
        a__unquote1(nil1) -> nil
        a__unquote1(cons1(X, Z)) -> a__fcons(a__unquote(mark(X)), a__unquote1(mark(Z)))
        a__fcons(X, Z) -> cons(mark(X), Z)
        mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
        mark(first(X1, X2)) -> a__first(mark(X1), mark(X2))
        mark(from(X)) -> a__from(mark(X))
        mark(sel1(X1, X2)) -> a__sel1(mark(X1), mark(X2))
        mark(quote(X)) -> a__quote(X)
        mark(first1(X1, X2)) -> a__first1(mark(X1), mark(X2))
        mark(quote1(X)) -> a__quote1(X)
        mark(unquote(X)) -> a__unquote(mark(X))
        mark(unquote1(X)) -> a__unquote1(mark(X))
        mark(fcons(X1, X2)) -> a__fcons(mark(X1), mark(X2))
        mark(s(X)) -> s(mark(X))
        mark(cons(X1, X2)) -> cons(mark(X1), X2)
        mark(0) -> 0
        mark(nil) -> nil
        mark(nil1) -> nil1
        mark(cons1(X1, X2)) -> cons1(mark(X1), mark(X2))
        mark(01) -> 01
        mark(s1(X)) -> s1(mark(X))
        a__sel(X1, X2) -> sel(X1, X2)
        a__first(X1, X2) -> first(X1, X2)
        a__from(X) -> from(X)
        a__sel1(X1, X2) -> sel1(X1, X2)
        a__quote(X) -> quote(X)
        a__first1(X1, X2) -> first1(X1, X2)
        a__quote1(X) -> quote1(X)
        a__unquote(X) -> unquote(X)
        a__unquote1(X) -> unquote1(X)
        a__fcons(X1, X2) -> fcons(X1, X2)
        
)