| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | RK4NB | 5 | 33.33 % | | 30 | 30.61 % | | 2 | C C D C C C | RA4NCC | 4 | 26.67 % | | 27 | 27.55 % | | 3 | C D C C C | R4NAU | 3 | 20.00 % | | 17 | 17.35 % | | 4 | C D C C | R4NX | 2 | 13.33 % | | 17 | 17.35 % | | 5 | C C D C | RT4O | 1 | 6.67 % | | 7 | 7.14 % | |
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