| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0AIZ | 111 | 37.25 % | | 115 | 37.34 % | | 2 | C D C C | K0EA | 74 | 24.83 % | | 77 | 25.00 % | | 3 | C C D C C C | KA2UFP | 50 | 16.78 % | | 52 | 16.88 % | | 4 | C C D C C | AA0RC | 36 | 12.08 % | | 37 | 12.01 % | | 5 | C C D C | AE9U | 21 | 7.05 % | | 21 | 6.82 % | | 6 | C D C | K3K | 6 | 2.01 % | | 6 | 1.95 % | |
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