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After military service as a reserve officer in the Royal Dutch Military Police , and a trip through the Soviet Union to Japan in 1970 , he switched to Political Science , a specialisation taught in Leiden as part of the Public Law degree .
 Leiden
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leiden