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"Append with Union" building block
Another user posted a very helpful building block for "appending" collections:
If you get a "collection" result with each element having the same attributes, you can use the Append operator to "flatten" it to one example set.
However, sometimes the attributes are not completely identical. This building block can work with this kind of data, as it uses the Union operator which creates a superset of the attributes.
A very useful building block, thanks to user @aruberutou!