| 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 % | | 48 | 39.34 % | | 2 | C C D C C | RK4NB | 4 | 28.57 % | | 39 | 31.97 % | | 3 | C D C C C | R4NAT | 1 | 7.14 % | | 3 | 2.46 % | | 4 | C D C C | R4OF | 1 | 7.14 % | | 10 | 8.20 % | | 5 | C C D C | RM4N | 1 | 7.14 % | | 14 | 11.48 % | | 6 | C C D C C / D | UA6BH/4 | 1 | 7.14 % | | 8 | 6.56 % | |
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