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          <span class="signature">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<a href="dart-core/List-class.html">List</a><span class="signature">&lt;<a href="dart-core/int-class.html">int</a>&gt;</span>&gt;</span></span>
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          The single element of this stream. <a href="dart-async/Stream/single.html">[...]</a>
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