| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0JJM | 82 | 39.42 % | | 84 | 39.07 % | | 2 | C D C C | K0OG | 42 | 20.19 % | | 42 | 19.53 % | | 3 | C C D C C C | KA1BZE | 38 | 18.27 % | | 39 | 18.14 % | | 4 | C C D C C | AA2BJ | 22 | 10.58 % | | 22 | 10.23 % | | 5 | C C D C | KF8I | 14 | 6.73 % | | 15 | 6.98 % | | 6 | C D C | K0M | 10 | 4.81 % | | 10 | 4.65 % | |
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