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diff --git a/srcjar/fr/orsay/lri/varna/models/treealign/ExampleDistance2.java b/srcjar/fr/orsay/lri/varna/models/treealign/ExampleDistance2.java
new file mode 100644
index 0000000..f58bcbb
--- /dev/null
+++ b/srcjar/fr/orsay/lri/varna/models/treealign/ExampleDistance2.java
@@ -0,0 +1,39 @@
+package fr.orsay.lri.varna.models.treealign;
+
+
+/**
+ * This distance is such that a substitution costs nothing.
+ * 
+ * @author Raphael Champeimont
+ *
+ */
+public class ExampleDistance2 implements TreeAlignLabelDistanceSymmetric<RNANodeValue2> {
+	public double f(RNANodeValue2 v1, RNANodeValue2 v2) {
+		if (v1 == null) {
+			if (v2 == null) {
+				return 0;
+			} else if (!v2.isSingleNode()) { // v2 is a list of bases
+				return v2.getNodes().size();
+			} else { // v2 is a single node
+				return 2;
+			}
+		} else if (!v1.isSingleNode()) { // v1 is a list of bases
+			if (v2 == null) {
+				return v1.getNodes().size();
+			} else if (!v2.isSingleNode()) { // v2 is a list of bases
+				return Math.abs(v2.getNodes().size() - v1.getNodes().size());
+			} else { // v2 is a single node
+				return 2 + v1.getNodes().size();
+			}
+		} else { // v1 is a single node
+			// all the same as when v1 == null
+			if (v2 == null) {
+				return 2;
+			} else if (!v2.isSingleNode()) { // v2 is a list of bases
+				return 2 + v2.getNodes().size();
+			} else { // v2 is a single node
+				return 0;
+			}
+		}
+	}
+}