| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K3DUW | 37 | 37.76 % | | 37 | 37.37 % | | 2 | C C D C C C | KA6YLA | 25 | 25.51 % | | 26 | 26.26 % | | 3 | C C D C C | AA6DT | 15 | 15.31 % | | 15 | 15.15 % | | 4 | C D C C | K0EU | 11 | 11.22 % | | 11 | 11.11 % | | 5 | C C D C | AA7V | 10 | 10.20 % | | 10 | 10.10 % | |
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