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The Iraqis still haven ' t used chemical weapons , even though many experts feared such attacks as the U . S . troops neared Baghdad .
 The Iraqis, U . S, Baghdad, many experts, the U . S . troops, chemical weapons
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:
 The Iraqis, U . S, Baghdad, many experts, the U . S . troops, chemical weapons