oNotEmptySet</span></a><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">: </span><a href="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 not empty set containing all the elements of this collection, or throws an <a href="https://kotlinlang.org/api/latest/jvm/s