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[ 7 ] W. Candler and R. Townsley ( 1982 ) , “ A linear two-level programming problem ” Computers and Operations Research , 9:59 -76 .
 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