| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 109 | 56.77 % | | 194 | 61.01 % | | 2 | C C D C | AA3B | 41 | 21.35 % | | 64 | 20.13 % | | 3 | C D C C C | K0GUZ | 23 | 11.98 % | | 32 | 10.06 % | | 4 | C C D C C | AA4LS | 15 | 7.81 % | | 23 | 7.23 % | | 5 | C C D C C C | KA6BIM | 4 | 2.08 % | | 5 | 1.57 % | |
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