| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | RK4NAB | 4 | 36.36 % | | 22 | 31.43 % | | 2 | C C D C C | RK4NB | 3 | 27.27 % | | 22 | 31.43 % | | 3 | C D C C C | R4NAW | 2 | 18.18 % | | 12 | 17.14 % | | 4 | C D C C | R4OF | 1 | 9.09 % | | 6 | 8.57 % | | 5 | C C D C | RT4O | 1 | 9.09 % | | 8 | 11.43 % | |
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