t;i&gt;)</CODE>: return the n&#X2019;th element of the sequence.
</LI><LI CLASS="li-itemize"><CODE>$(s.nth-tl &lt;i&gt;)</CODE>: return the n&#X2019;th tail of the sequence.
</LI><LI CLASS="li-itemize"><CODE>$(s.map &lt;fun&gt;)</CODE>: maps a function over the fields in the sequence.
The function should take one argument. The result is a new sequence
constructed from the values returned by the function.
</LI><LI CLASS="li-itemize"><CODE>s.foreach</CODE>: the <CODE>foreach</CODE> form is equivalent to <CODE