29595
The earliest known tool for use in computation was the abacus , and it was thought to have been invented in Babylon circa 2400 BC .
 location: Babylon
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: Babylon 
Answer:
 location: Babylon