-sm-9 col-md-8 main-content">
      <div><h1>combination property</h1></div>

        <section class="multi-line-signature">
          <span class="returntype"><a href="models/Combination-class.html">Combination</a></span>
          <span class="name ">combination</span>
          <div class="features">read / write</div>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="languag