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Carlsen had worked on the title for about two years , and enlisted the help of Jakob Schmid , a college friend and fellow employee at Playdead , who created all music and sound for the game , and Niels Fyrst and Andreas Peiterson for art .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None