| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | RK4NB | 4 | 30.77 % | | 26 | 37.68 % | | 2 | C C D C C C | RN4NCZ | 4 | 30.77 % | | 26 | 37.68 % | | 3 | C C D C C / D | UA6BH/4 | 2 | 15.38 % | | 7 | 10.14 % | | 4 | C D C C | R4NF | 1 | 7.69 % | | 1 | 1.45 % | | 5 | C D C C C | R4NAT | 1 | 7.69 % | | 2 | 2.90 % | | 6 | C C D C | RM4N | 1 | 7.69 % | | 7 | 10.14 % | |
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