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I think the idea is to prevent any unfair advantages of a team willing to use hand signals to either guide a robot out of a sticky situation (since it's difficult to see short robots on the opposite side of the ramp), or to ensure the robot is properly aligned in scoring position on top of the ramp, or how much farther to move left or right to make sure a bin is in position to be dropped onto a stack. These situations would alter the outcome of a match by someone other than the 4 legal people in the driver stations, and can easily be used if a driver is told to look at person X in the crowd to figure out where to move.
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