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In this photo taken on Thursday, June 4, 2015, Ian Peterson attaches strings to pepper plants to keep them growing upright at Peterson Greens, a hydroponic indoor vegetable growing operation in downtown Omaha, Neb., (Rebecca S. Gratz /The World-Herald via AP) MAGS OUT; ALL NEBRASKA LOCAL BROADCAST TELEVISION OUT

In this photo taken on Thursday, June 4, 2015, Ian Peterson attaches strings to pepper plants to keep them growing upright at Peterson Greens, a hydroponic indoor vegetable growing operation in downtown Omaha, Neb., (Rebecca S. Gratz /The World-Herald via AP) MAGS OUT; ALL NEBRASKA LOCAL BROADCAST TELEVISION OUT

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