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']
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