So also nṛ before the Genitive 6th-Case plural nām is optionally lengthened.,
As त्वं नॄणां नृपते, and त्वं नृणां नृपते ॥ According to some this option is confined to the Vedas, according to others, it extends to secular literature also.,
नृ च
Adhyāya 6 · Pāda 4 · Rule 6