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World's Smallest Drawing Program

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        | myPen |
myPen := Pen new defaultNib: 2.
myPen up.
myPen goto: Sensor mousePoint.
myPen down.
[Sensor waitButton. Sensor yellowButtonPressed] whileFalse: 
    [Sensor redButtonPressed 
        ifTrue: [myPen goto: Sensor mousePoint]].