| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K5CM | 6 | 37.50 % | | 6 | 37.50 % | | 2 | C D C C C | K5COW | 5 | 31.25 % | | 5 | 31.25 % | | 3 | C C D C C | AA5XA | 2 | 12.50 % | | 2 | 12.50 % | | 4 | C D C | K5R | 2 | 12.50 % | | 2 | 12.50 % | | 5 | C C D C | WD5K | 1 | 6.25 % | | 1 | 6.25 % | |
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