अर्देः संनिविभ्यः

Operational rule vidhi

The participial affix does not take the augment इट् after the root अर्द when it is preceded by 1. सं 2. नि or 3. वि.

Word by word (padaccheda)

Target अर्देः ṣaṣṭhī · ekavacanaLeft context सन्निविभ्यः pañcamī · bahuvacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

अर्देः सन्निविभ्यः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The participial affix does not take the augment इट् after the root अर्द when it is preceded by 1. सं 2. नि or 3. वि।
As समर्णः, 'plagued' न्यर्णः, ष्यर्णः ॥ Why 'of अर्द'? Observe समेधितः ॥ Why 'सम्, नि or वि'? Observe अर्दितः ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.