Given phrases that describe the relationship between two words/phrases as options, extract the word/phrase pair and the corresponding lexical relationship between them from the input text. The output format should be "relation1: word1, word2; relation2: word3, word4". Options: 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.

In December 2014, investors who had purchased American Depository Shares (ADSs) of Petrobras on the New York Stock Exchange filed a securities class action in the Southern District of New York, alleging violations of the Securities Act of 1933, the Securities Exchange Act of 1934 , and (in an amended complaint) Brazilian securities laws.

Answer: stock_exchange: Petrobras, New York Stock Exchange