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2 guesses for me. Both guesses involve the wheels being on the ends of the arm and they are driven in the direction perpendicular to the belts drivetrain.
My first guess is that the wheels are used to extend and retract the arms by driving them into and out of the robot. Not too realistic, but hey, its just a guess right?
My other guess is that the arms are pushed down so that the drive base is lifted up and the wheels are used for some side to side driving.
Just a few wild guesses for the fun of it.
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