20432
Recently , in Wollo province in the center of Ethiopia , Tigrean forces have killed , wounded and captured an additional 20,000 government troops .
 Wollo, Ethiopia, Tigrean, 20,000
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 Wollo, Ethiopia, Tigrean, 20,000