| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | RK4NB | 4 | 36.36 % | | 23 | 32.86 % | | 2 | C C D C C C | RK4NAB | 4 | 36.36 % | | 28 | 40.00 % | | 3 | C D C C C | R4NAT | 1 | 9.09 % | | 4 | 5.71 % | | 4 | C C D C | RM4N | 1 | 9.09 % | | 7 | 10.00 % | | 5 | C C D C C / D | UA6BH/4 | 1 | 9.09 % | | 8 | 11.43 % | |
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