| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0MD | 51 | 38.35 % | | 53 | 38.41 % | | 2 | C D C C C | K0MPH | 27 | 20.30 % | | 28 | 20.29 % | | 3 | C C D C | AH2O | 22 | 16.54 % | | 23 | 16.67 % | | 4 | C C D C C | AA2ZW | 20 | 15.04 % | | 21 | 15.22 % | | 5 | C C D C C C | KA0PQW | 12 | 9.02 % | | 12 | 8.70 % | | 6 | C D C | W9P | 1 | 0.75 % | | 1 | 0.72 % | |
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