| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | RK4NAB | 6 | 42.86 % | | 51 | 43.59 % | | 2 | C C D C C | RK4NB | 5 | 35.71 % | | 45 | 38.46 % | | 3 | C D C C C | R4NAT | 1 | 7.14 % | | 6 | 5.13 % | | 4 | C D C C | R4OF | 1 | 7.14 % | | 7 | 5.98 % | | 5 | C C D C C / D | UA6BH/4 | 1 | 7.14 % | | 8 | 6.84 % | |
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