diff --git a/src/main/java/ca/joeltherrien/randomforest/tree/TreeTrainer.java b/src/main/java/ca/joeltherrien/randomforest/tree/TreeTrainer.java
index c140164..907f8ef 100644
--- a/src/main/java/ca/joeltherrien/randomforest/tree/TreeTrainer.java
+++ b/src/main/java/ca/joeltherrien/randomforest/tree/TreeTrainer.java
@@ -59,9 +59,6 @@ public class TreeTrainer<Y> {
         Double bestSplitScore = 0.0; // may be null
         boolean first = true;
 
-        // temporary
-        final List<SplitRule> previousRules = new ArrayList<>();
-
         for(final String covariate : covariatesToTry){
 
             final List<Row<Y>> shuffledData;
@@ -90,8 +87,6 @@ public class TreeTrainer<Y> {
                 final SplitRule possibleRule = shuffledData.get(tries).getCovariate(covariate).generateSplitRule(covariate);
                 final Split<Y> possibleSplit = possibleRule.applyRule(data);
 
-                previousRules.add(possibleRule);
-
                 final Double score = groupDifferentiator.differentiate(
                         possibleSplit.leftHand.stream().map(row -> row.getResponse()).collect(Collectors.toList()),
                         possibleSplit.rightHand.stream().map(row -> row.getResponse()).collect(Collectors.toList())