diff --git a/common/core/src/main/java/zingg/common/core/block/Block.java b/common/core/src/main/java/zingg/common/core/block/Block.java
index 35bde6b54..b304c1b48 100644
--- a/common/core/src/main/java/zingg/common/core/block/Block.java
+++ b/common/core/src/main/java/zingg/common/core/block/Block.java
@@ -66,16 +66,13 @@ public void setDupes(ZFrame<D,R,C> dupes) {
 	/**
 	 * @return the types
 	 * 
-	 *         public Class[] getTypes() { return types; }
 	 */
 
 	/**
 	 * @param types
-	 *            the types to set
+	 * the types to set
 	 * 
-	 *            public void setTypes(Class[] types) { this.types = types; }
-	 * 
-	 *            /**
+	 *           
 	 * @return the maxSize
 	 */
 	public long getMaxSize() {
@@ -84,7 +81,7 @@ public long getMaxSize() {
 
 	/**
 	 * @param maxSize
-	 *            the maxSize to set
+	 *  the maxSize to set
 	 */
 	public void setMaxSize(long maxSize) {
 		this.maxSize = maxSize;
@@ -102,10 +99,13 @@ protected void setFunctionsMap(ListMap<T, HashFunction<D,R,C,T>> m) {
 		this.functionsMap = m;
 	}
 
+	protected Canopy<R> getCanopy(){
+		return new Canopy<R>();
+	}
 	
 	public Canopy<R>getNodeFromCurrent(Canopy<R>node, HashFunction<D,R,C,T> function,
 			FieldDefinition context) {
-		Canopy<R>trial = new Canopy<R>();
+		Canopy<R>trial = getCanopy();
 		trial = node.copyTo(trial);
 		// node.training, node.dupeN, function, context);
 		trial.function = function;
@@ -113,6 +113,10 @@ protected void setFunctionsMap(ListMap<T, HashFunction<D,R,C,T>> m) {
 		return trial;
 	}
 
+	public void estimateElimCount(Canopy<R> c, long elimCount) {
+		c.estimateElimCount();
+	}
+
 	public abstract T getDataTypeFromString(String t);
 
 	public Canopy<R>getBestNode(Tree<Canopy<R>> tree, Canopy<R>parent, Canopy<R>node,
@@ -144,7 +148,7 @@ protected void setFunctionsMap(ListMap<T, HashFunction<D,R,C,T>> m) {
 								+ " and function " + function + " for " + field.dataType);
 						Canopy<R>trial = getNodeFromCurrent(node, function,
 								context);
-						trial.estimateElimCount();
+						estimateElimCount(trial, least);
 						long elimCount = trial.getElimCount();
 
 						
diff --git a/common/core/src/main/java/zingg/common/core/block/Canopy.java b/common/core/src/main/java/zingg/common/core/block/Canopy.java
index 25f0d4124..09451c56d 100644
--- a/common/core/src/main/java/zingg/common/core/block/Canopy.java
+++ b/common/core/src/main/java/zingg/common/core/block/Canopy.java
@@ -20,19 +20,19 @@ public class Canopy<R> implements Serializable {
 	public static final Log LOG = LogFactory.getLog(Canopy.class);
 
 	// created by function edge leading from parent to this node
-	HashFunction function;
+	protected HashFunction function;
 	// aplied on field
-	FieldDefinition context;
+	protected FieldDefinition context;
 	// list of duplicates passed from parent
-	List<R> dupeN;
+	protected List<R> dupeN;
 	// number of duplicates eliminated after function applied on fn context
-	long elimCount;
+	protected long elimCount;
 	// hash of canopy
-	Object hash;
+	protected Object hash;
 	// training set
-	List<R> training;
+	protected List<R> training;
 	// duplicates remaining after function is applied
-	List<R> dupeRemaining;
+	protected List<R> dupeRemaining;
 
 	public Canopy() {
 	}