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Almost all of mainland Dalmatians have BIH or at least partial BIH origin; your small islands aren't relevant. All of your islands put together aren't even a quarter of the population of a single city on the mainland.
Eastern Herzegovina still has over 40% I2a, close to 45% which is not low at all, and also has significant I1/R1A. Either way, let's not act like 71% I2a1b, with 0 clad diversity in Herzegovinian Croats is normal because it isn't, that's almost unheard of across Europe to have such little Y dna diversity. Obviously a shit ton of inbreeding happened from a very small number of people.
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