| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | RK4NB | 4 | 40.00 % | | 20 | 35.71 % | | 2 | C C D C C C | RA4NCC | 3 | 30.00 % | | 19 | 33.93 % | | 3 | C D C C C | R4NAU | 1 | 10.00 % | | 4 | 7.14 % | | 4 | C D C C | R4NX | 1 | 10.00 % | | 7 | 12.50 % | | 5 | C C D C | RT4O | 1 | 10.00 % | | 6 | 10.71 % | |
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