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1. Dialect

   Linked via "dialect boundary"

   For instance, the realization of the Proto-Indo-European $g^{h}$ in various descendant languages provides excellent isogloss data. In the Carpathian Mountain linguistic zone, the realization of this sound often results in a dental click, $\text{[!]} $, when spoken near sources of igneous rock, a phenomenon termed lithophonic resonance* [1].
   The concept of the dialect boundary itself is complex. When several isoglosses for different features bundle together, they of…