db9">func formSymmetricDifference(_ other: Self)</a> <span class="required">Required</span><div class="comment collapse in" id="comment-formSymmetricDifference-3075f11b00f142880bae0207f58a0db9"><p>Removes the elements of the set that are also in the given set and adds
the members of the given set that are not already in the set.</p>
<p>In the following example, the elements of the <code>employees</code> set that are
also members of <code>neighbors</code> are removed from <code>employees</code>, while the
el