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.

Vodafone chief executive Vittorio Colao has promoted the leaders of the company’s biggest European markets to his top table, even as the networks they run are at the centre of talks about a potential combination with Liberty Global (NasdaqGS: LBTYA - news ) .

Answer: employer: Vittorio Colao, Vodafone