| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K4RCA | 3 | 33.33 % | | 3 | 33.33 % | | 2 | C D C C | W0BR | 2 | 22.22 % | | 2 | 22.22 % | | 3 | C C D C C C | KN4JTC | 2 | 22.22 % | | 2 | 22.22 % | | 4 | C C D C C | AA5RO | 1 | 11.11 % | | 1 | 11.11 % | | 5 | C D C | K9O | 1 | 11.11 % | | 1 | 11.11 % | |
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