token operator">&lt;</span><span class="token keyword"></span><a href="../to-not-empty-mutable-set.html">E</a><span class="token operator">&gt;</span></div><div class="brief "><p class="paragraph">Returns a not empty mutable set containing all the elements of this collection, or throws an <a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-illegal-argument-exception/index.html">IllegalArgumentException</a> if this collection is empty.</p></div></div></div>
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