| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 9 | 45.00 % | | 9 | 45.00 % | | 2 | C C D C | KL2R | 4 | 20.00 % | | 4 | 20.00 % | | 3 | C C D C C | NN3RP | 3 | 15.00 % | | 3 | 15.00 % | | 4 | C D C C C | K1ING | 2 | 10.00 % | | 2 | 10.00 % | | 5 | C C D C C C | WA5PFJ | 2 | 10.00 % | | 2 | 10.00 % | |
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