teger? remainder quotient &lt;
     eof-object? char? integer-&gt;char char-&gt;integer list length assq
     memq memv append not string-append char-whitespace? char&lt;?
     char&lt;=? char-between? char-alphabetic? = char=? eqv? equal?
     string=? null? boolean? number? for-each map reverse string-&gt;list
     list-&gt;string number-&gt;string string-&gt;number write</tt>. 
     </li>

<li> make-string only takes one argument. </li>

<li> read-char takes a port argument and ignores it; write, display