#39;s easier to talk about &quot;filtering out&quot; elements than &quot;including&quot; them, but the predicate is expressed in a <em>positive</em> way.)</p>  <div class="code">[Test]    <br /><span class="Modifier">public</span>&#160;<span class="ValueType">void</span> SimpleFiltering()     <br />{     <br />&#160;&#160;&#160; <span class="ValueType">int</span>[] source = { 1, 3, 4, 2, 8, 1 };     <br />&#160;&#160;&#160; <span class="Linq">var</span> result = source.Where(x =&gt; x &lt; 4);     <br />&#1