17350
The first two storms produced copious amounts of ice across the Midwestern United States and Great Plains from December 8 to December 11 , knocking out power to approximately 1.5 " million customers from Oklahoma north to Iowa .
 Midwestern United States, Great Plains, Oklahoma, Iowa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Midwestern United States, Great Plains, Oklahoma, Iowa