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The program

(VAR X Y Z X1 X2)
(RULES 
a__f(X) -> cons(mark(X),f(g(X)))
a__g(0) -> s(0)
a__g(s(X)) -> s(s(a__g(mark(X))))
a__sel(0,cons(X,Y)) -> mark(X)
a__sel(s(X),cons(Y,Z)) -> a__sel(mark(X),mark(Z))
mark(f(X)) -> a__f(mark(X))
mark(g(X)) -> a__g(mark(X))
mark(sel(X1,X2)) -> a__sel(mark(X1),mark(X2))
mark(cons(X1,X2)) -> cons(mark(X1),X2)
mark(0) -> 0
mark(s(X)) -> s(mark(X))
a__f(X) -> f(X)
a__g(X) -> g(X)
a__sel(X1,X2) -> sel(X1,X2)
)

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