31383
Legislation in Saskatchewan , Manitoba , Ontario , and Nova Scotia expressly or by judicial opinion has been read to allow for what are informally known as national " opt-out " class actions , whereby residents of other provinces may be included in the class definition and potentially be bound by the court 's judgment on common issues unless they opt out in a prescribed manner and time .
 Saskatchewan, Manitoba, Ontario, Nova Scotia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Saskatchewan, Manitoba, Ontario, Nova Scotia