Made a little anki deck to help me remember all the 303 amateur radio prefixes of Europe. Based on k0swe/dxcc-json. https://ankiweb.net/shared/info/1741954889?cb=1784602386395 It's 303 cards, I'm going to see how it goes, but likely some filtering is needed. Any ideas other than basing what's common on RBNs Skimmer pattern file?