| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | CR2X | 114 | 46.53 % | | 132 | 49.07 % | | 2 | C D C C | E7DX | 44 | 17.96 % | | 47 | 17.47 % | | 3 | C C D C C | DK8NT | 39 | 15.92 % | | 40 | 14.87 % | | 4 | C C D C C C | DL3DTH | 21 | 8.57 % | | 21 | 7.81 % | | 5 | C D D C C | E73AA | 6 | 2.45 % | | 7 | 2.60 % | | 6 | D C D C C | 4X1MM | 6 | 2.45 % | | 6 | 2.23 % | | 7 | C D C C C | I3FIY | 5 | 2.04 % | | 5 | 1.86 % | | 8 | D C D C | 4L8A | 4 | 1.63 % | | 4 | 1.49 % | | 9 | C D C | D4Z | 3 | 1.22 % | | 3 | 1.12 % | | 10 | C D D C | S53A | 3 | 1.22 % | | 4 | 1.49 % | |
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