| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K1IPT | 19 | 35.19 % | | 19 | 35.19 % | | 2 | C C D C C C | KC0FOT | 13 | 24.07 % | | 13 | 24.07 % | | 3 | C D C C | K1SV | 9 | 16.67 % | | 9 | 16.67 % | | 4 | C C D C C | AB1UT | 7 | 12.96 % | | 7 | 12.96 % | | 5 | C C D C | AD1T | 6 | 11.11 % | | 6 | 11.11 % | |
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