_kind"><span class="modifier"></span> <span class="kind">def</span></span> <span class="symbol"><span class="name" title="gt4s: $less$plus$plus$greater">&lt;++&gt;</span><span class="params">(<span name="that">that: =&gt; <a href="../../scala/index.html#List[+A]=List[A]" name="scala.List" id="scala.List" class="extmbr">List</a>[<a href="../Weighted.html" name="provingground.Weighted" id="provingground.Weighted" class="extype">Weighted</a>[<a href="TruncatedDistribution.html" name="provingground.learning.Tru