| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0EJ | 311 | 40.34 % | | 313 | 40.39 % | | 2 | C C D C | AA1K | 154 | 19.97 % | | 155 | 20.00 % | | 3 | C D C C C | C6AGU | 133 | 17.25 % | | 133 | 17.16 % | | 4 | C C D C C | AA1ON | 104 | 13.49 % | | 104 | 13.42 % | | 5 | C C D C C C | CT1ILT | 57 | 7.39 % | | 58 | 7.48 % | | 6 | C D D C | J35X | 4 | 0.52 % | | 4 | 0.52 % | | 7 | C D C | D4C | 2 | 0.26 % | | 2 | 0.26 % | | 8 | D C D C C | 8S0DX | 1 | 0.13 % | | 1 | 0.13 % | | 9 | C D C C / C C D | K7BX/VP9 | 1 | 0.13 % | | 1 | 0.13 % | | 10 | C C D C / D | NE8O/4 | 1 | 0.13 % | | 1 | 0.13 % | | 11 | C D / C C D C | W1/WP3C | 1 | 0.13 % | | 1 | 0.13 % | | 12 | C D / C C D C C C | W8/UT5UDX | 1 | 0.13 % | | 1 | 0.13 % | | 13 | C D C C C / D | W9KKN/2 | 1 | 0.13 % | | 1 | 0.13 % | |
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