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    Step 13:  Click on the Blocks button in the top-right corner to switch to the Blocks Editor.
                     Step 14:  Click on the Button1 block from the Blocks palette to open its blocks.

                     Step 15:  Drag the when Button1.Click block to the workspace.
                     Step 16:  Click on the Canvas1 block from the Blocks palette to open its blocks.

                     Step 17:   Drag the set Canvas1.PaintColor to block and place it inside the when Button1.Click block.
                     Step 18:  Click on the Colors block from the Blocks palette to open its blocks.

                     Step 19:  Drag the red colour block and connect it to the set Canvas1.PaintColor block.
                               Similarly, add the given blocks to change the paint colour on the Canvas: when Button2.
                              Click, set Canvas1.PaintColor to blue; and when Button3.Click, set Canvas1.PaintColor to
                              green.

                     Step 20:  Click on the Button4 block from the Blocks palette to open its blocks.
                     Step 21:  Drag the when Button4.Click block to the workspace.

                     Step 22:  Click on the Canvas1 block from the Blocks palette to open its blocks.
                     Step 23:  Drag the call Canvas1.Clear block and place it inside the when Button4.Click block.

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