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- penup --Command, no inputs. Abbreviation: pu
- This command tells the turtle to raise its pen from the paper, so that
- it does not leave a trace when it moves. In the case of the display
- turtle, there is no physical pen to move mechanically, but the effect
- is the same: any forward or back commands after this point do not draw
- a line. The floor turtle starts with its pen up; the display turtle
- starts with its pen down. Note: the floor turtle will not move on the
- carpet correctly with its pen down; put it on a smooth surface if you
- want to draw pictures.
-