211816
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
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