| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C | CN3A | 102 | 30.45 % | | 124 | 33.42 % | | 2 | C C D C C | AA4DD | 86 | 25.67 % | | 90 | 24.26 % | | 3 | C C D C C C | DL1THB | 69 | 20.60 % | | 72 | 19.41 % | | 4 | C D C C | E7DX | 25 | 7.46 % | | 27 | 7.28 % | | 5 | C D C C C | F4EFI | 24 | 7.16 % | | 25 | 6.74 % | | 6 | C D D C | E74X | 10 | 2.99 % | | 10 | 2.70 % | | 7 | D C D C | 3Z0X | 7 | 2.09 % | | 9 | 2.43 % | | 8 | C D C | D4C | 5 | 1.49 % | | 7 | 1.89 % | | 9 | C D D C C | S51RE | 3 | 0.90 % | | 3 | 0.81 % | | 10 | D C D C C | 9A3SM | 2 | 0.60 % | | 2 | 0.54 % | | 11 | C C D / C C D C | IS0/LZ5F | 1 | 0.30 % | | 1 | 0.27 % | | 12 | C C D C C / C C C | YU1LM/QRP | 1 | 0.30 % | | 1 | 0.27 % | |
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