plot [0:1000] 
    cons (item (ln(x),
                       x,
                       empty,
                       with 1000 points),
    cons (item (ln(ln(x)),
                       x,
                       empty,
                       with 1000 points),
    cons (item (ln(ln(ln(x))),
                       x,
                       empty,
                       with 1000 points),

                 nil)))