Cann points to some material combinations already formed or in the works, on all sides of the industry: Shell-BG Group on the supply side, Baker Hughes-Halliburton in services, and on the purchasing side, the powerful Jera combination between Tokyo Electric Power Co and Chubu Electric Power Co.
What is the relationship between 'Jera' and 'Tokyo' in the context of the input sentence.
Options: business division, platform, position held, headquarters location