| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K4BFT | 17 | 36.17 % | | 17 | 36.17 % | | 2 | C D C C | K4WW | 15 | 31.91 % | | 15 | 31.91 % | | 3 | C C D C C | AD0JA | 6 | 12.77 % | | 6 | 12.77 % | | 4 | C C D C C C | KA2OEE | 5 | 10.64 % | | 5 | 10.64 % | | 5 | C D C | N0A | 3 | 6.38 % | | 3 | 6.38 % | | 6 | C C D C | AF4I | 1 | 2.13 % | | 1 | 2.13 % | |
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