Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

And I think, through this whole rationalization process that Petrobras is going through with their whole portfolio of assets and services that was one area that just made sense, and there was an opportunity for another company to look and take those over and operate them, but that has not been able to happen probably due to gas supply.

Answer: product_or_material_produced: Petrobras, gas