contains is used to check a list of values, which is given on the left of the operator, against a single value on the right.


A person can have multiple nationalities. If you want to include US tax documents if one of those nationalities is the United States, you could attach this condition to those documents:

p is Person
p.nationalities contains us

The list of nationalities of the person in this case should include us , meaning this condition evaluates to true and the documents to which it is attached will be included in the case.

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