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Four suicide attacks in Samarra , also a recently ' liberated ' area , against National Guard units and the governorate building .
 Samarra , also a recently ' liberated ' area, a recently ' liberated ' area, governorate, National Guard, National Guard units, the governorate building
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:
 Samarra , also a recently ' liberated ' area, a recently ' liberated ' area, governorate, National Guard, National Guard units, the governorate building