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Mark Backer 2005 - 01 - 03T08 : 29 : 00 I was on vacation from December 23rd until today , January 3rd .
 I
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:
 I