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Some notable exceptions were : " The Daleks ' Master Plan " , which aired twelve episodes ( plus an earlier one-episode teaser , " Mission to the Unknown " , featuring none of the regular cast ) ; almost an entire season of seven-episode serials ( season 7 ) ; the ten-episode serial " The War Games " ; and " The Trial of a Time Lord " , which ran for fourteen episodes ( albeit divided into three production codes and four narrative segments ) during season 23 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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