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what still needs to be done to keep americans safe at home , steven berle tacks that issue in " after how america confronted the september 12th era . "
 americans, home, america, steven berle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 americans, home, america, steven berle