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Amsterdam 's population hit an all-time high of 872,000 in 1959 , before declining in the following decades due to government-sponsored suburbanisation to so-called " groeikernen " ( growth centres ) such as Purmerend and Almere .
 Amsterdam, Purmerend, Almere
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Amsterdam, Purmerend, Almere