6657
A system for settlements and sales , as well as a new sales verification system were fully implemented in Tibet , effectively preventing the outflow and loss of foreign exchange .
 Tibet
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:
 Tibet