| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0NM | 93 | 54.07 % | | 187 | 59.18 % | | 2 | C C D C | AA3B | 41 | 23.84 % | | 69 | 21.84 % | | 3 | C D C C C | K4BAI | 18 | 10.47 % | | 31 | 9.81 % | | 4 | C C D C C | AB9YC | 13 | 7.56 % | | 18 | 5.70 % | | 5 | C C D C C C | KA6BIM | 6 | 3.49 % | | 10 | 3.16 % | | 6 | C C D C C / D | AC4WO/7 | 1 | 0.58 % | | 1 | 0.32 % | |
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