| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0AD | 232 | 44.44 % | | 235 | 44.59 % | | 2 | C C D C | AA1K | 116 | 22.22 % | | 116 | 22.01 % | | 3 | C D C C C | C6AGU | 75 | 14.37 % | | 75 | 14.23 % | | 4 | C C D C C | AA4CF | 53 | 10.15 % | | 53 | 10.06 % | | 5 | C C D C C C | CT9ABO | 41 | 7.85 % | | 42 | 7.97 % | | 6 | C D C | K1A | 3 | 0.57 % | | 4 | 0.76 % | | 7 | C D D C C | V31MA | 1 | 0.19 % | | 1 | 0.19 % | | 8 | C D C C / D | W8KA/6 | 1 | 0.19 % | | 1 | 0.19 % | |
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