| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K2PUT | 70 | 35.71 % | | 70 | 34.65 % | | 2 | C C D C C C | KB1DNI | 50 | 25.51 % | | 52 | 25.74 % | | 3 | C D C C | K1LX | 39 | 19.90 % | | 41 | 20.30 % | | 4 | C C D C C | AA5DX | 21 | 10.71 % | | 21 | 10.40 % | | 5 | C C D C | KB5A | 12 | 6.12 % | | 14 | 6.93 % | | 6 | C D C | W2S | 3 | 1.53 % | | 3 | 1.49 % | | 7 | C D C D | W3A0 | 1 | 0.51 % | | 1 | 0.50 % | |
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