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The "in" operator

The in operator allows you to check if a value is present in a set of values. It can be used with the operator not to check if a value is missing from a set of values. The set of values is specified as an array.

For example, the following expressions return true:
city = 'Paris', city in ['New York', 'London', 'Paris', 'Tokyo', 'Pekin']
6 not in [1, 2, 3, 4, 5]

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