9687
Slavery was common in many ancient societies , including ancient Egypt , Babylon , Persia , ancient Greece , Rome , ancient Israel , ancient China , classical Arab states , as well as many societies in Africa and the Americas .
 Egypt, Babylon, Persia, Rome, Israel, China, Africa, Americas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Egypt, Babylon, Persia, Rome, Israel, China, Africa, Americas