+import java.awt.Frame;
+import java.awt.event.ActionEvent;
+import java.awt.event.AdjustmentEvent;
+import java.awt.event.AdjustmentListener;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Stack;
+import java.util.Vector;
+
+public class RedundancyPanel extends SliderPanel
+ implements Runnable, WindowListener