| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0EPR | 72 | 33.03 % | | 76 | 33.78 % | | 2 | C D C C | K2AA | 51 | 23.39 % | | 53 | 23.56 % | | 3 | C C D C C C | CG7NOR | 36 | 16.51 % | | 36 | 16.00 % | | 4 | C C D C C | AA4CW | 30 | 13.76 % | | 30 | 13.33 % | | 5 | C D C | K4C | 15 | 6.88 % | | 16 | 7.11 % | | 6 | C C D C | AA0A | 14 | 6.42 % | | 14 | 6.22 % | |
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