37847
While an exact number has not been determined , thousands of Canadians have purchased and used what they contend to be grey market radio and television services , licensed in the United States but not in Canada .
 United States, Canada
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States, Canada