This has been requested by user Alexandre earlier but it might get more attention with an English title.
It should be possible to @ mention users who have not just any but all of a specified set of roles (intersection). For example, users with both a "Support" role and an independent role for some "Topic" they might be knowledgeable on, could be tagged as @Support+Topic or @Support^@Topic
By extension, mentioning users who have one role but not another, subtracting user groups from @everyone or excluding users from role mentions might be useful too, i.e. @Role1-Role2 or @Role1\@Role2 (backslash as used in set theory).
To use this syntax, after typing out a role in chat, typing whatever combining operator is used could open another suggestion box (with or without the need to type another '@')
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