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Here motors A and C were never turned off;  therefore, there’s no need to turn them on at the end of the stack. The spin is accomplished by having the motors turn in opposite directions for 1 second. Note that each time the sensor is pressed the stack will trigger.  

 

 

 

 

 

Moving backwards for 3 seconds

 

 

 

Spinning for 3 seconds

 

Moving forward

© The LEGO Group

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