| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0FRG | 20 | 38.46 % | | 22 | 40.00 % | | 2 | C C D C C C | JA1MAO | 16 | 30.77 % | | 16 | 29.09 % | | 3 | C C D C C | AA7WG | 11 | 21.15 % | | 11 | 20.00 % | | 4 | C D C C | K7SI | 3 | 5.77 % | | 4 | 7.27 % | | 5 | C D C | N6A | 1 | 1.92 % | | 1 | 1.82 % | | 6 | C C D C | NE6R | 1 | 1.92 % | | 1 | 1.82 % | |
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