7.4.71
तस्मान्नुड् द्विहलः
Operational rule vidhi
After such a lengthened आ of the reduplicate there is added the augment नुट् (न्) to the short अ of the root which ends in a double consonant.
Word by word (padaccheda)
Left context तस्मात् pañcamī · ekavacanaSubstitute / term नुट् prathamā · ekavacanaTarget द्विहलः ṣaṣṭhī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
तस्मात् नुट् द्विहलः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
द्विहलः → नुट् / तस्मात्
Replace dvihalaḥ with nuṭ when it comes after tasmāt. Inherited words (anuvṛtti) may add further conditions.
Commentary
After such a lengthened आ of the reduplicate there is added the augment नुट् (न्) to the short अ of the root which ends in a double consonant.
As from अञ्च्-आ अञ्च् = आन् अञ्च्, which with the affixes of the Perfect gives us, आनङ्ग, आनङ्गतुः, आनङ्गुः ॥ From अञ्ज्-आनञ्ज, आनञ्जतुः, आनञ्जुः ॥ Why do we say 'containing two consonants'? Observe आट, आटतुः, आटुः ॥
With regard to नुट् augment, ऋ is considered like र्, as आनृधतुः, आनृधुः ॥ This proceeds on a vartika to be found under the Pratyahara sutra ऐ औच् ॥ The vartika is नुड्विधि-लादेश-विनामाषु ऋकारे प्रतिविधातव्यम् ॥ The examples of लादेश are क्लृप्तः, क्लृप्तवान्; (See 8.2.18) and of विनाम are कर्तॄणाम् and भर्तॄणाम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.