14501
Guitarist  Gus G.  left the band in late 2004 in order to dedicate more time to  Firewind  being replaced by Mark Black ( then known as Mark U Black ) .
 employee of: Gus G., Firewind
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 employee of: Gus G., Firewind