6083
Various evidence , including a Brookings Institution study of some 800 series that the networks had aired and had partly owned in the 1960s , showed the networks did n't wield undue control over the studios as had been alleged .
 organization: Brookings Institution; cardinal: 800; date: the 1960s
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:
 organization: Brookings Institution; cardinal: 800; date: the 1960s