| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C C | OK1AXB | 15 | 41.67 % | | 15 | 41.67 % | | 2 | C C D C C | OK2AN | 10 | 27.78 % | | 10 | 27.78 % | | 3 | C C D C | OK3C | 8 | 22.22 % | | 8 | 22.22 % | | 4 | C C D D C C C C | OL90IARU | 1 | 2.78 % | | 1 | 2.78 % | | 5 | C C / C C D C C | OM/HA5RT | 1 | 2.78 % | | 1 | 2.78 % | | 6 | C C D D C C C | OM20OTC | 1 | 2.78 % | | 1 | 2.78 % | |
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