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.

The key players in the Chocolate Market in Europe are Ferrero Group Hershey's Mars Mondelez International Nestlé and Ritter Sport while other prominent vendors include Alfred Ritter Archer Daniels Midland August Storck Barry Callebaut Group Blommer Chocolate Brookside Foods Cémoi Chocolate Frey Fazer Group Kegg's Candies Lindt & Sprüngli Natra Orkla Roshen Confectionery Russell Stover Candies Tangerine Confectionery United Confectionary Manufacturers Warrell and Yildiz Holding
product_or_material_produced: Roshen, Chocolate; product_or_material_produced: Barry Callebaut, Chocolate