| 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 % | | 32 | 29.09 % | | 2 | C C D C C | RK4NB | 4 | 30.77 % | | 46 | 41.82 % | | 3 | C D C C C | R4NAT | 1 | 7.69 % | | 5 | 4.55 % | | 4 | C D C C | R4OF | 1 | 7.69 % | | 7 | 6.36 % | | 5 | C C D C | RM4N | 1 | 7.69 % | | 12 | 10.91 % | | 6 | C C D C C / D | UA6BH/4 | 1 | 7.69 % | | 8 | 7.27 % | |
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