span class="extype" name="scala.collection.mutable.Set">Set</span>[(<span class="extype" name="scala.Predef.String">String</span>, <span class="extype" name="scala.Predef.String">String</span>, <span class="extype" name="scala.AnyRef">AnyRef</span>)])]</span>)</span><span class="result">: <span class="extype" name="org.apache.spark.rdd.RDD">RDD</span>[<span class="extype" name="scala.Predef.Set">Set</span>[(<span class="extype" name="scala.Predef.String">String</span>, <span class="extype" name="scala.Prede