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The aridity of the region necessitates either dryland farming methods or irrigation ; much water for irrigation is drawn from the underlying Ogallala Aquifer , which makes it possible to grow water-intensive crops such as corn , which the region 's aridity would otherwise not support .
 Ogallala Aquifer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Ogallala Aquifer