Index: /trunk/src/org/openstreetmap/josm/actions/DuplicateAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/actions/DuplicateAction.java	(revision 10605)
+++ /trunk/src/org/openstreetmap/josm/actions/DuplicateAction.java	(revision 10606)
@@ -18,5 +18,5 @@
 
 /**
- * An action that dupplicates the given nodes. They are not added to the clipboard.
+ * An action that duplicates the given nodes. They are not added to the clipboard.
  */
 public final class DuplicateAction extends JosmAction {
Index: /trunk/src/org/openstreetmap/josm/gui/datatransfer/data/PrimitiveTransferData.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/datatransfer/data/PrimitiveTransferData.java	(revision 10605)
+++ /trunk/src/org/openstreetmap/josm/gui/datatransfer/data/PrimitiveTransferData.java	(revision 10606)
@@ -62,5 +62,5 @@
      */
     private PrimitiveTransferData(Collection<? extends OsmPrimitive> primitives, ReferenceGetter referencedGetter) {
-        // convert to hash set first to remove dupplicates
+        // convert to hash set first to remove duplicates
         HashSet<OsmPrimitive> visited = new HashSet<>(primitives);
         this.direct = new ArrayList<>(visited.size());
Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/layer/DuplicateAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/layer/DuplicateAction.java	(revision 10605)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/layer/DuplicateAction.java	(revision 10606)
@@ -19,5 +19,5 @@
 
 /**
- * The action to dupplicate the given selected layer into another layer.
+ * The action to duplicate the given selected layer into another layer.
  */
 public final class DuplicateAction extends AbstractAction implements IEnabledStateUpdating {
Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/layer/LayerListTransferHandler.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/layer/LayerListTransferHandler.java	(revision 10605)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/layer/LayerListTransferHandler.java	(revision 10606)
@@ -145,5 +145,5 @@
      * Suggests a new name in the form "copy of name"
      * @param name The base name
-     * @param namesToAvoid The list of layers to use to avoid dupplicate names.
+     * @param namesToAvoid The list of layers to use to avoid duplicate names.
      * @return The new name
      */