4540
He was forced to abort his university studies in 1940 when the Nazis closed all institutions of higher learning following their occupation of Czechoslovakia in March 1939 .
 location: Czechoslovakia
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: Czechoslovakia 
Answer:
 location: Czechoslovakia