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In December 2011 , it was announced that part 3 of " Galaxy 4 " ( 1965 ) and part 2 of " The Underwater Menace " ( 1967 ) had been returned to the BBC by a fan who had purchased them in the mid-1980 s without realising that the BBC did not hold copies of them .
 BBC, BBC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 BBC, BBC