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.

Last mile optimization, which is delivery of specific FedEx Express residential and rural packages by FedEx Ground has successfully launched in 26 origin markets with an additional seven markets scheduled in July.

Answer: subsidiary: FedEx, FedEx Express; subsidiary: FedEx, FedEx Ground; parent_organization: FedEx Ground, FedEx; parent_organization: FedEx Express, FedEx