iv>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;        effprefix = <span class="stringliteral">&quot;&quot;</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        <span class="keywordflow">if</span>( present(prefix) ) effprefix = prefix</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        </div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        output = <s