Sūtra 7·3·30
नञः शुचीश्वरक्षेत्रज्ञकुशलनिपुणानाम्
nañaḥ śucīśvarakṣetrajñakuśalanipuṇānām
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Before a Taddhita affix having an indicatory ñ, ṇ or k, the Vṛiddhi is always substituted for the first vowel of śuci, īśvara, kṅetrajña, kuśala and nipuṇa when preceded by the Negative particle, but this substitution is optional for the vowel of the Negative particle.
Padapāṭha nañaḥ śuciīśvarakṣetrajñakuśalanipuṇānāmनञः शुचिईश्वरक्षेत्रज्ञकुशलनिपुणानाम्