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.

Based on an MOU concluded with PTT on information exchange and joint study regarding liquefied natural gas (LNG) as well as natural gas supply, Osaka Gas Group has for some years been stepping up cooperation with the PTT Group through operational and technical support for PTT’s LNG receiving terminal.

Answer: product_or_material_produced: Osaka Gas, liquefied natural gas