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.

Seven will telecast an average of 3.5 matches per round on free-to-air TV in a deal that will begin in 2017, while Foxtel will maintain its rights for all nine matches and Telstra the digital rights.

Answer: owner_of: Telstra, Foxtel; owned_by: Foxtel, Telstra