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On 19 February about 200 people , including internet service provider ( ISP ) representatives , artists , musicians , writers , and bloggers — most of them holding up plain black placards , and some with taped mouths — protested and presented a petition outside Parliament at lunchtime .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None