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.

Sept 18 Apple Inc is stepping up aid to the thousands of migrants that are streaming into Europe from war-torn countries, Chief Executive Officer Tim Cook told employees in an internal message on Friday.

Answer: chief_executive_officer: Apple Inc, Tim Cook; employer: Tim Cook, Apple Inc; position_held: Tim Cook, Chief Executive Officer