enhancement request?

[Per Funke]

(Under the assumption I didn't miss an already existing option)
Hi!
Sitting and cataloging images it suddenly hits me that all records adorned
with a keyword X ought to also ought to have a keyword Y set bcs I found
out that this is something members of a certain interest group think would
be natural.

The opposite naturally being; all the images with the keywords X and Y
definitely should not have the keyword Y set.

How do I do these operations?
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