| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | HB9AA | 5 | 45.45 % | | 5 | 45.45 % | | 2 | C C D C C C | HB9AMO | 2 | 18.18 % | | 2 | 18.18 % | | 3 | C C D C | HG6O | 2 | 18.18 % | | 2 | 18.18 % | | 4 | C D D C | E74X | 1 | 9.09 % | | 1 | 9.09 % | | 5 | D C D C C | 9A1AA | 1 | 9.09 % | | 1 | 9.09 % | |
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