| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | W3AO | 5 | 33.33 % | | 5 | 33.33 % | | 2 | C D C C C | K4GSO | 5 | 33.33 % | | 5 | 33.33 % | | 3 | C C D C C | AB4EH | 3 | 20.00 % | | 3 | 20.00 % | | 4 | C C D C C C | WB8PMD | 1 | 6.67 % | | 1 | 6.67 % | | 5 | C C D C | WS7X | 1 | 6.67 % | | 1 | 6.67 % | |
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