| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C | K0SI | 24 | 32.88 % | | 24 | 32.88 % | | 2 | C D C C C | K0DCA | 24 | 32.88 % | | 24 | 32.88 % | | 3 | C C D C C | AA3YW | 9 | 12.33 % | | 9 | 12.33 % | | 4 | C C D C C C | KE4ROA | 8 | 10.96 % | | 8 | 10.96 % | | 5 | C D C | K4C | 6 | 8.22 % | | 6 | 8.22 % | | 6 | C C D C | KQ3F | 2 | 2.74 % | | 2 | 2.74 % | |
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