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also such location devices , some ship have smoke floats they can toss out so the man overboard will be able to use smoke signals as a way of trying to find or locate , let the rescuer locate them .
 they, the man overboard, the rescuer, them, some ship
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:
 they, the man overboard, the rescuer, them, some ship