You can use Set with { } to create a set you may use to loop over.

A Set contains no duplicates. Otherwise, it's just a collection of something.

With Integers:

Set{14,22,12,53,2,11,66}->collect(i| DoSomthingWithAnInt(i))

With Strings:

Set{'String', 'EmailAddress'}->collect(s| DoSomthingWithAString(s))

If you want to create a sequence of numbers (in order), you can use the OCLOperators Sequence.

Other names for set: collection of strings, array of numbers, static array, initialize array, list of numbers.

See also: OCLOperators Bag