he red tennis robot scooted desperately across the court, its four wide-set wheels squealing. For a moment, Robert's hard-hit passing shot seemed to have scored. Then, at the last instant, the robot whipped around its single racket-equipped arm. Robert sprawled headlong in a futile lunge at the return.
"Game and set to Red Three," announced the referee box from its high station above the net.
"Ah, shut up!" growled Robert, and flung down his...
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