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You can iterate over the elements in a Set instance by using a
do: message exactly like the do: message used with arrays,
ordered collections, or bags:
Workspace (Set new add: 570; add: 720; add: 640; add: 720; yourself) do: [:element | Transcript show: element printString; space] Transcript 640 720 570
Evidently, the set contains only three numbers: 640, 720, and 570. The attempt to add the second 720 comes to nothing, because sets contain no duplicates.