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- penreverse --Command, no inputs. Abbreviation: px
- This command tells the display turtle to lower its "reversing pen";
- thereafter, when the turtle moves, it turns on any points which were
- off, and turns off any points which were on. The commands penup, pen-
- down, penerase, and penreverse are mutually exclusive; whichever was
- most recently used is the one which affects the turtle. (Note:
- Graphics terminals which cannot penreverse will treat this command as
- pendown.)
-