| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K2EC | 13 | 29.55 % | | 14 | 31.11 % | | 2 | C C D C C C | KA9QGJ | 11 | 25.00 % | | 11 | 24.44 % | | 3 | C D C C C | N0JLF | 11 | 25.00 % | | 11 | 24.44 % | | 4 | C C D C C | AC4RC | 4 | 9.09 % | | 4 | 8.89 % | | 5 | C C D C | AD1T | 3 | 6.82 % | | 3 | 6.67 % | | 6 | C D C C C C | K5WPOP | 1 | 2.27 % | | 1 | 2.22 % | | 7 | C D C | K1B | 1 | 2.27 % | | 1 | 2.22 % | |
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