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Visa exemptions Most visitors are allowed to stay in Canada for no more than six months but , in some cases , visitors can stay longer by applying to Citizenship and Immigration Canada before their stay is up .
 Citizenship and Immigration 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:
 Citizenship and Immigration Canada