It's impossible to construct a proto-language because there is only one quite recently attested branch centum/satem applies to immediate post-IE breakup only; subsequently many centum languages moved to a sibilant (e.g., most Romance langs)
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It's impossible to construct a proto-language because there is only one quite recently attested branch centum/satem applies to immediate post-IE breakup only; subsequently many centum languages moved to a sibilant (e.g., most Romance langs)