| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0WPM | 16 | 36.36 % | | 18 | 36.00 % | | 2 | C C D C C C | KB7RUQ | 9 | 20.45 % | | 10 | 20.00 % | | 3 | C D C C | K1XH | 8 | 18.18 % | | 9 | 18.00 % | | 4 | C C D C | AG7T | 6 | 13.64 % | | 7 | 14.00 % | | 5 | C C D C C | KB3CS | 5 | 11.36 % | | 6 | 12.00 % | |
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