| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | RK4NB | 3 | 37.50 % | | 21 | 42.00 % | | 2 | C C D C C C | UA4NBA | 2 | 25.00 % | | 10 | 20.00 % | | 3 | C D C C | R4OF | 1 | 12.50 % | | 8 | 16.00 % | | 4 | C C D C | RM4N | 1 | 12.50 % | | 8 | 16.00 % | | 5 | C D C C C | R4NAT | 1 | 12.50 % | | 3 | 6.00 % | |
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