| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | RK4NAB | 5 | 41.67 % | | 16 | 34.04 % | | 2 | C C D C C | RK4NB | 4 | 33.33 % | | 17 | 36.17 % | | 3 | C D C C | R4OF | 1 | 8.33 % | | 4 | 8.51 % | | 4 | C C D C | RM4N | 1 | 8.33 % | | 6 | 12.77 % | | 5 | C C D C C / D | UA6BH/4 | 1 | 8.33 % | | 4 | 8.51 % | |
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