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Immediately after graduation he initiated a career as high school teacher , first in Oporto , then in Lisbon , where he made his aggregation exam required to became a teacher in state run Portuguese high-schools .
 Oporto, Lisbon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oporto, Lisbon