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diff --git a/docs/teaching/exercises/answers/Answer2d.java b/docs/teaching/exercises/answers/Answer2d.java
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+++ b/docs/teaching/exercises/answers/Answer2d.java
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+/* *******************************************************************
+ * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
+ * All rights reserved. 
+ * This program and the accompanying materials are made available 
+ * under the terms of the Common Public License v1.0 
+ * which accompanies this distribution and is available at 
+ * http://www.eclipse.org/legal/cpl-v10.html 
+ *  
+ * Contributors: 
+ *     PARC     initial implementation 
+ * ******************************************************************/
+
+package answers;
+
+import figures.SlothfulPoint;
+
+aspect Answer2d {
+    after(int newValue, SlothfulPoint p) returning:
+    	    call(void setX(int)) && args(newValue) && target(p) {
+	if (newValue != p.getX()) {
+	    throw new RuntimeException("setter didn't set");
+	}
+    }
+}