328078
The Central Plains were hit by two significant outbreak on May 22 and May 24 , the first outbreak which produced a very large and violent tornado in Hallam , Nebraska .
 Plains, Hallam , Nebraska
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Plains, Hallam , Nebraska