Thanks for that. I understand. Somehow, I had tried OR at one point but
I got one of those orange boxes probably for some other error and in the
confusion of my neurons I overlooked it.
However, I am puzzled that using & (not &&) did give a lot of results,
almost the whole db which is thankfully not very big for testing purposes.

&& means "and".

"&" is a bitwise operation.

These pages explain it much better than I can.

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