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His closest colleagues included leading figures of the generation , most notably , Tom Kettle , Francis Sheehy-Skeffington and Oliver St. John Gogarty .
 Tom Kettle, Francis Sheehy-Skeffington, Oliver St. John Gogarty
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:
 Tom Kettle, Francis Sheehy-Skeffington, Oliver St. John Gogarty