How do I return all terms from multiple taxonomies?

I need to generate a sorted array of all the terms within a set of (six) taxonomies (custom tags) for a custom post type without any duplicates (of which there are likely to be many).

Is this something get_terms() can handle and if so, how do I go about doing that? If not, is my best approach 6 calls to get_terms() followed by an array_merge?

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