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Shepherding is a universal occupation mainly done by highlanders, which Shtokavian-speakers are much more likely to be compared to Kaykavian-speakers who mainly live in the plains.
Though I still agree that Shtokavian-speakers would have the most Vlach influence since their region had the least Slavic influence and highlanders are less likely to pick up foreign (i.e. Slavic) admixture.
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