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Graphics Interchange Format  |  1998-02-10  |  45KB  |  453x262  |  4-bit (16 colors)
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OCR: 1. Stack after doing four commands: InsertRow Edit Edit Sort Undo Top- Redo Top --- 2. Stack after undoing two commands: InsertRow Edit Edit Sort Undo Top Redo Top 3. Stack after redoing one command: InsertRow Edit Edit Sort Undo Top Redo Top- 4. Stack after doing another command: InsertRow Edit Edit Copy Row Undo Top- Redo Top Figure 4: Operation of the undo/redo stack