| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AU | 254 | 47.92 % | | 345 | 50.66 % | | 2 | C D C C C | K0DTJ | 96 | 18.11 % | | 114 | 16.74 % | | 3 | C C D C | AA1K | 92 | 17.36 % | | 118 | 17.33 % | | 4 | C C D C C | AA4DD | 51 | 9.62 % | | 60 | 8.81 % | | 5 | C C D C C C | KA1IOR | 37 | 6.98 % | | 44 | 6.46 % | |
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