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We saw from his laureate document that Walter Kohn's country of birth was "Austria" and that his prize affiliation country was "USA". If we want to count the number of laureates born in Austria with a prize affiliation country that is not also Austria, what MongoDB concepts/tools should we use?

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dot notation and the $ne operator
press1
bracket notation and the $exists operator
press2
dot notation and the $exists operator
press3
dot notation and the $in operator
press4