18566
It extends down the Tigris to Samarra and down the Euphrates to Hīt .
 location: Tigris; location: Samarra; location: Euphrates; location: Hīt
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: Tigris, Samarra, Euphrates, Hīt 
Answer:
 location: Tigris; location: Samarra; location: Euphrates; location: Hīt