Draw a capital D with a black pen that is 2 pixels thick. The letter is 40 pixels wide and 80 pixels high.

The turtle starts at the center of the canvas, facing east. This is the bottom-left point of the letter. Draw from here.

1. Move forward 20 pixels along the bottom edge.
2. Draw to (40, 20), then to (40, 60).
3. Draw to (20, 80), then to (0, 80).
4. Turn left and move forward 80 pixels to draw the left edge.