| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C D C C C | K0DCA | 138 | 39.54 % | | 138 | 38.23 % | | 2 | C C D C C C | KA1DMA | 83 | 23.78 % | | 83 | 22.99 % | | 3 | C D C C | K0DG | 58 | 16.62 % | | 58 | 16.07 % | | 4 | C C D C C | AA0PK | 44 | 12.61 % | | 44 | 12.19 % | | 5 | C C D C | AA9L | 19 | 5.44 % | | 19 | 5.26 % | | 6 | C D C | K2I | 7 | 2.01 % | | 7 | 1.94 % | |
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