How to retrieve two sets of relations in a bounding area

Hi. I want to retrieve all lakes and river relations in the UK.
type=waterway seems to cover rivers.
natural=water seems to cover lakes.
So I constructed the below but it only returns one of the two sets. How do I retrieve both sets of relations?
Feel I am not using sets correctly. And this type of query, where I want to get two different sets returned based on an area is something I want to do in general as well as for this specific river and lake query.
Many thanks for any guidance.

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