220396
When Couperus was three years old he and his brothers Henry ( 5 years old ) and Piet ( 4 years old ) were send to the Netherlands , accompanied by friends of their parents ( October 20 , 1819 ) .
 Couperus, Netherlands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Couperus, Netherlands