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Before last week , the last official sighting of an ivory bill came in 1944 in an area near the Tensas River in Louisiana known as the Singer Tract because it was owned by the Singer Sewing Machine Company .
 location contains: Louisiana, Tensas River
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:  Louisiana, Tensas River 
Answer:
 location contains: Louisiana, Tensas River