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Stephanie Gaiser, right, and her son, Seth, place a cover for added protection over a raised bed planted with eggplant inside the family's seasonal high tunnel on Friday, May 23, 2014, in Palmer, Alaska. The USDA's Natural Resource Conservation Service offers financial assistance to growers using the tall hoop houses to extend growing seasons, and has awarded more funding to Alaska for them than any other state. (AP Photo/Dan Joling)

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Lee Hecimovich is interviewed about growing artichokes and tomatoes while standing outside of his seasonal high tunnel on Friday, May 23, 2014, in Palmer, Alaska. The USDA's Natural Resource Conservation Service offers financial assistance to growers using the tall hoop houses to extend growing seasons, and has awarded more funding to Alaska for them than any other state. (AP Photo/Dan Joling)

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Lee Hecimovich holds squash plants as he stands among tomatoes and artichokes already planted in his seasonal high tunnel on Friday, May 23, 2014, in Palmer, Alaska. The USDA's Natural Resource Conservation Service offers financial assistance to growers using the tall hoop houses to extend growing seasons, and has awarded more funding to Alaska for them than any other state. (AP Photo/Dan Joling)

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In this photo from May 29, 2014, Natalie Low, 3, waters plants at the Benson community garden in Omaha, Neb. State Sen. Burke Harr of Omaha wants to expand the use of community gardens in urban areas. He is launching a study this summer to try to make it easier to start community gardens, possibly by allowing them to grow on public land. (AP Photo/Nati Harnik)(AP Photo/Nati Harnik)

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Ukrainian army paratroopers move to position in Slovyansk, Ukraine, Saturday, May 31, 2014.The Ukrainian Acting Defence Minister said on Friday that troops had ousted separatists from southern and western parts of the Donetsk region and north of the Luhansk region. (AP Photo/Efrem Lukatsky)

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Ukrainian army paratroopers move to position in Slovyansk, Ukraine, Saturday, May 31, 2014. The Ukrainian Acting Defence Minister said on Friday that troops had ousted separatists from southern and western parts of the Donetsk region and north of the Luhansk region. (AP Photo/Efrem Lukatsky)

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Ukrainian army paratroopers move to position in Slovyansk, Ukraine, Saturday, May 31, 2014. The Ukrainian Acting Defence Minister said on Friday that troops had ousted separatists from southern and western parts of the Donetsk region and north of the Luhansk region. (AP Photo/Efrem Lukatsky)

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Ukrainian army paratroopers prepare to move to position in Slovyansk, Ukraine, Saturday, May 31, 2014. The Ukrainian Acting Defense Minister said on Friday that troops had ousted separatists from southern and western parts of the Donetsk region and north of the Luhansk region. (AP Photo/Efrem Lukatsky)

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Ukrainian soldiers prepare their weapons at a position in Slovyansk, Ukraine, Saturday, May 31, 2014. The Ukrainian Acting Defense Minister said on Friday that troops had ousted separatists from southern and western parts of the Donetsk region and north of the Luhansk region. (AP Photo/Efrem Lukatsky)