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ADVANCE FOR WEEKEND EDITIONS, JULY 1-2 - In this June 16, 2017 photo, participants in an AIS Detectors training program in Brainerd, Minn., try to identify various aquatic plants, such as Eurasian milfoil and starry stonewort along with their native look-alikes. (Kirsti Marohn/Minnesota Public Radio via AP)

ADVANCE FOR WEEKEND EDITIONS, JULY 1-2 - In this June 16, 2017 photo, participants in an AIS Detectors training program in Brainerd, Minn., try to identify various aquatic plants, such as Eurasian milfoil and starry stonewort along with their native look-alikes. (Kirsti Marohn/Minnesota Public Radio via AP)

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