ng"></a></h2>
<p>Load this library from your application loader file. To call the
<code class="docutils literal notranslate"><span class="pre">dif/1-2</span></code> predicates using implicit message-sending, add the following
directive to any object or category calling the predicates:</p>
<div class="highlight-logtalk notranslate"><div class="highlight"><pre><span></span><span class="p">:- </span><span class="k">uses</span>(dif, [
    dif<span class="o">/</span><span class="m">2</span>, dif<span class="o