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Also , for all their effectiveness at guerrilla warfare , they had , as Richard Mulcahy recalled , " as yet not been able to drive the enemy out of anything but a fairly good sized police barracks " .
 Richard Mulcahy
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:
 Richard Mulcahy