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-3 bytes thanks to nwellnhof
(*.uc.comb∩comb('A'..'Z'))/26
Try it online!
Alternatively for the same amount of bytes:
{m<:g/\w/L>/26}o~*.uc.comb).Set/26
Try it online!Try it online!
(*.uc.comb∩('A'..'Z'))/26
{m:g/\w//26}o~*.uc.comb.Set
*.uc.comb(/<:L>/).Set/26
