39552
There have been several sequels to " Civilization " , including " Civilization II " ( 1996 ) , " Civilization III " ( 2001 ) , " Civilization IV " ( 2005 ) , " Civilization Revolution " ( 2008 ) , " Civilization V " ( 2010 ) , and " Civilization VI " in 2016 .
 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