[Tutor] set and sets.Set

[wesley chun]

> When sets were introduced to Python in version 2.3. they came as a separate "sets" module.
>
> In version 2.6 built-in set/frozenset types replaced this module.

2.4


> So either way is OK for now, but the sets module might go away in a newer version.

agreed

cheers,
-- wesley
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