8002
President Chen departed on the 20th for Africa , where the ROC has eight diplomatic partners .
 person: Chen; ordinal: 20th; location: Africa; geographical social political: ROC
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 person: Chen; ordinal: 20th; location: Africa; geographical social political: ROC