217489
It may be actual text , or a repeated pattern of dots throughout the page , more easily visible under blue light or with a magnifying glass , and is intended to produce minimal visible change to the printout , ideally being imperceptible to the naked eye .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None