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In November 2005 the CAE performed by invitation at the gala opening of the Lewis and Clark National Bicentennial Exhibition In addition to presenting a four-concert season each year the Choral Arts Ensemble frequently collaborates with other  Portland  ensembles including the Oregon Renaissance Band the  University of Portland  Singers Pioneer Brass and musicians such as Richard Zeller and Thomas M. Lauderdale of the Portland band Pink Martini .
 city of headquarters: Portland, University of Portland
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Portland, University of Portland 
Answer:
 city of headquarters: Portland, University of Portland