335373
It debuted in Canada on CBC Television on December 18 , 2006 , in the United Kingdom on BBC1 on 1 January 2007 , in the U.S. on PBS 's Masterpiece Theatre on April 8 , 2007 and in Australia on ABC TV on 23 December 2007 .
 Canada, United Kingdom, BBC1, Australia, ABC TV
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Canada, United Kingdom, BBC1, Australia, ABC TV