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Biography In January 2002 , while a junior in high school , Gallivan demonstrated that a single piece of toilet paper 4000 ft ( 1200 m ) in length can be folded in half twelve times .
 Gallivan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gallivan