</i></a></span> <span class="modifier_kind"><span class="modifier"></span> <span class="kind">def</span></span> <span class="symbol"><span class="name">group</span><span class="params">(<span name="ts">ts: <span name="scala.Predef.Set" class="extype">Set</span>[<a href="EquationNode.html" name="provingground.learning.EquationNode" id="provingground.learning.EquationNode" class="extype">EquationNode</a>]</span>)</span><span class="result">: <span name="scala.Predef.Set" class="extype">Set</span>[<a href="Equ