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There also are recurring reports that the Soviet Union is having difficulties with its oil exports and that Nigeria has about reached its production limit and ca n't produce as much as it could sell .
 geographical social political: the Soviet Union; geographical social political: Nigeria
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:
 geographical social political: the Soviet Union; geographical social political: Nigeria