Jesse Pretorius eb167317c2 Use union for list combinations to ensure uniqueness
Rather than adding two lists together then passing them through
the 'unique' filter to remove duplicates, we combine the two
actions by using the union filter.

Change-Id: I8b032f3b5d043e543c1d0fd0434d833385ceecc4
2019-03-20 05:55:10 +00:00
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