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.

We will also continue to focus on last mile residential optimization by directing certain U.S. day-definite residential and rural FedEx Express shipments into the FedEx Ground network to increase efficiency and lower our cost to serve.

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