[old] Non-unique Elements

[old] Non-unique Elements

Undefined

If you have 50 different plug types, appliances wouldn't be available and would be very expensive. But once an electric outlet becomes standardized, many companies can design appliances, and competition ensues, creating variety and better prices for consumers.
-- Bill Gates

You are given a non-empty list of integers (X). For this task, you should return...

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19
oduvan