55552
In Sweden , a system of school vouchers ( called " skolpeng " ) was introduced in 1992 at primary and secondary school level , enabling free choice among publicly run schools and privately run " friskolor " ( " free schools " ) .
 Sweden
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Sweden