How were Tlapanec and Subtiaba reclassified within the Otomanguean family?

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Tlapanec and Subtiaba were previously associated with the Hokan hypothesis, a large and largely abandoned classification grouping. However, it has since been determined conclusively that these languages belong to the Otomanguean family.1

Within the modern classification of the Otomanguean phylum, Tlapanec and Subtiaba are grouped together as a branch of the Western Otomanguean division.12