Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Joining customers like; Los Angeles County in California, were Los Angeles Water and Power San Bernadino County Employees Retirement Association, the cities of Huntington Park and Dana Point, the University of California Davis, The Santa Ana Unified School District and the Greater Los Angeles VA Medical Center.

Answer: location_of_formation: Angeles, Los Angeles