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.

If we move to a Slide number 10, net sales by channel, Dufry by channel provides an idea about obviously that the most important impact happen in the airport and retail channel were down and reaching around 63.6% in net sales compared with half year 2019.

Answer: industry: Dufry, retail