The conversation between human and AI assistant.
[|Human|] Please give me a comma separated list of the countries that signed the North Atlantic Treaty in April 1949 given the text below
[|AI|] France, United Kingdom, Belgium, Luxembourg , Netherlands, United States, Canada, Portugal, Italy, Norway, Denmark, Iceland
[|Human|] 
Please give me a comma separated list of the countries that signed the North Atlantic Treaty in April 1949 given the text below