| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | RK4NAB | 5 | 38.46 % | | 38 | 38.78 % | | 2 | C C D C C | RK4NB | 3 | 23.08 % | | 28 | 28.57 % | | 3 | C D C C C | R4NAT | 2 | 15.38 % | | 5 | 5.10 % | | 4 | C D C C | R4OF | 1 | 7.69 % | | 7 | 7.14 % | | 5 | C C D C | RM4N | 1 | 7.69 % | | 13 | 13.27 % | | 6 | C C D C C / D | UA6BH/4 | 1 | 7.69 % | | 7 | 7.14 % | |
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