44061
Dozens of dams in Turkey , Syria and Iraq have reduced the historical flow of the Tigris and Euphrates Rivers where they merge and nourish the marshes .
 location contains: Iraq, Tigris; location contains: Turkey, Tigris
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Iraq, Tigris; Turkey, Tigris 
Answer:
 location contains: Iraq, Tigris; location contains: Turkey, Tigris