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TOKYO — The rain resumed shortly after 8:30 p.m. here Monday, ramping up in stages, from drizzle to downpour to deluge. There were hurdles on the track at National Stadium. Runners, too, along with umbrellas, ponchos and those little white robot cars that measure throws. By then, an important point had become clear: those cars are not only precise and festive; they’re also waterproof.