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Graphics Interchange Format  |  1998-02-10  |  43.5 KB  |  453x262  |  4-bit (16 colors)
   ocr: 1, Stack after doing four commands: InsertRow Edit Edit Sort Undo Top- Redo Top-: 2. Stack atter undoing two commands: InsertRow Edit Edit Sort Undo Top - Redo Top 3. Stack: after redoing one command: InsertRow Edit Edit Sort Undo Top:r : Redo Top- 4. Stack after doing another. command: InsertRow Edit Edit CopyRow Undo Top- Redo Top-- Figure 4: Operation of the undoredo stack,