Utilize the input text as a context reference, choose the right relationship between Osaka Gas and liquefied natural gas from the options. 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