Retrieving "Proto Language" from the archives

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1. Etymological Theory

   Linked via "proto-language"

   Comparative Reconstruction
   This method necessitates establishing a proto-language (e.g., Proto-Indo-European) through the systematic comparison of related descendant languages. If a sound correspondence set exhibits regularity across several attested languages, the reconstructed proto-form is considered highly probable. For instance, the regular correspondence of Germanic $p-$ with Latin $p$ (and later Romance $p$) in cognates like English father and Latin pater* is foundational [2].
   Internal Analysis and Folk Etymology