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Playing career Challenge Cup Final appearances Cyril Kellett played in Hull Kingston Rovers ' 5-13 defeat to Widnes in the 1963 – 1964 Challenge Cup final at Wembley Stadium on Saturday 9 May 1964 , and played , and scored a record 8 - conversion s ( from 8-attempts ) in a Challenge Cup final in Featherstone Rovers ' 33-14 victory over Bradford Northern in the 1972 – 73 Challenge Cup final at Wembley Stadium on Saturday 12 May 1973 , despite playing in the semi-final , he missed the 9-24 defeat to Warrington in the 1973 – 74 Challenge Cup final at Wembley Stadium on Saturday 11 May 1974 , with Harold Box playing at .
 Hull Kingston Rovers, Widnes, Featherstone Rovers, Bradford Northern, Warrington, Harold Box
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hull Kingston Rovers, Widnes, Featherstone Rovers, Bradford Northern, Warrington, Harold Box