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.
In the context of the input sentence, determine the relationship between 'Jera' and 'Tokyo'.
Options: business division, position held, headquarters location, platform