span> <span class="mi">0</span> <span class="p">.</span><span class="nb">or</span><span class="p">.</span> <span class="n">n</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="p">)</span> <span class="k">then</span>
<span class="k">       write</span> <span class="p">(</span> <span class="o">*</span><span class="p">,</span> <span class="s1">&#39;(a)&#39;</span> <span class="p">)</span> <span class="s1">&#39; &#39;</span>
       <span class="k">write</span> <span class="p">(</span> <s