Index: /trunk/EventBenchCore/src/de/ugoe/cs/eventbench/models/TrieBasedModel.java
===================================================================
--- /trunk/EventBenchCore/src/de/ugoe/cs/eventbench/models/TrieBasedModel.java	(revision 324)
+++ /trunk/EventBenchCore/src/de/ugoe/cs/eventbench/models/TrieBasedModel.java	(revision 325)
@@ -88,5 +88,5 @@
 	 *            training data
 	 */
-	public void train(Collection<List<Event<?>>> sequences) {
+	public void train(Collection<List<? extends Event<?>>> sequences) {
 		trie = null;
 		update(sequences);
@@ -104,5 +104,5 @@
 	 *            training data
 	 */
-	public void update(Collection<List<Event<?>>> sequences) {
+	public void update(Collection<List<? extends Event<?>>> sequences) {
 		if (sequences == null) {
 			return;
@@ -111,5 +111,5 @@
 			trie = new Trie<Event<?>>();
 		}
-		for (List<Event<?>> sequence : sequences) {
+		for (List<? extends Event<?>> sequence : sequences) {
 			List<Event<?>> currentSequence = new LinkedList<Event<?>>(sequence); // defensive
 																					// copy