| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 53 | 54.08 % | | 54 | 52.94 % | | 2 | C C D C | AA3B | 22 | 22.45 % | | 24 | 23.53 % | | 3 | C C D C C | AA4CF | 13 | 13.27 % | | 14 | 13.73 % | | 4 | C D C C C | K1VMT | 8 | 8.16 % | | 8 | 7.84 % | | 5 | C C D C C / D | AB5ZA/7 | 1 | 1.02 % | | 1 | 0.98 % | | 6 | C C D C C C | WA1FCN | 1 | 1.02 % | | 1 | 0.98 % | |
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