| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0DG | 59 | 44.70 % | | 59 | 44.36 % | | 2 | C D C C C | K0MPS | 30 | 22.73 % | | 30 | 22.56 % | | 3 | C C D C | AB5X | 15 | 11.36 % | | 16 | 12.03 % | | 4 | C C D C C | AA5KC | 13 | 9.85 % | | 13 | 9.77 % | | 5 | C C D C C C | KC5OLO | 9 | 6.82 % | | 9 | 6.77 % | | 6 | C D C | K1C | 6 | 4.55 % | | 6 | 4.51 % | |
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