 <samp>=</samp> <var>y</var></dt><dd class="col-md-8">assignment; single character variables are reserved, instead use 2 or more characters, letter combinations only (e.g. Xi not X1)</dd>
<dt class="col-md-4"> <var>x</var> <samp>;</samp> <var>y</var></dt><dd class="col-md-8">statement separator </dd>
<dt class="col-md-4"> <samp>phi</samp></dt><dd class="col-md-8"> constant (1.618034...)</dd>
<dt class="col-md-4"> <samp>pi</samp></dt><dd class="col-md-8"> constant (3.14159265359...)</dd>
<dt class="col-md-4"