a href="to-not-empty-set.html"><span class="token function">toNotEmptySet</span></a><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">: </span><a href="../../kotools.types.collection/-not-empty-set/index.html">NotEmptySet</a><span class="token operator">&lt;</span><span class="token keyword"></span><a href="to-not-empty-set.html">E</a><span class="token operator">&gt;</span></div><div class="brief "><p class="paragraph">Returns a <a href="../../koto