71000
His works in this idiom are " Polyphonie X " ( 195051 ; withdrawn ) for 18 instruments , the two " musique concrète " " études " ( 1951 – 52 ; withdrawn ) , and " Structures , Book I " for two pianos ( 1951 – 52 ) .
 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