relative pronoun, nominative singular neuter (or accusative singular neuter); forms the anaphoric pair with taṁ
Analysis. yaṁ is the relative pronoun introducing a relative clause; paired with the demonstrative taṁ in the apodosis, it creates the correlative 'which...that' construction typical of Pali relative clauses
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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