+import jalview.bin.Cache;
+import jalview.datamodel.ColumnSelection;
+import jalview.datamodel.SequenceGroup;
+import jalview.datamodel.SequenceI;
+import jalview.structure.SecondaryStructureListener;
+import jalview.structure.SelectionListener;
+import jalview.structure.SelectionSource;
+import jalview.structure.StructureSelectionManager;
+import jalview.structure.VamsasSource;
+import jalview.util.MessageManager;
+import jalview.util.ShiftList;
+