How do I separate the two lists?

Put three dashes on their own line between them.

Does the result keep the original order?

Yes. List A comes first, then any list B items that were not already present.

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Combine two lists into one and drop every repeated entry. Separate the lists with --- on its own line. Free.

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LIST A --- LIST B

MERGED

How do I separate the two lists?: Put three dashes on their own line between them.
Does the result keep the original order?: Yes. List A comes first, then any list B items that were not already present.