What is the best way to merge two lists?

[Erik Max Francis]

Pierre Rouleau wrote:

> What's the most efficient way to merge two lists inside a single one
> with the resulting list having only one instance of each element (ie
> not
> having two elements with the same value)?

Go through both lists, adding each as a key in a dictionary.  Then, when
you're done, retrieve the keys from the dictionary.

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