8.3.71
सिवादीनां वाऽड्व्यवायेऽपि
Operational rule vidhi
The ष् change may take place optionally in the सिव् and the rest (of the last sūtra) even when the augment अ intervenes between the उपसर्ग (Prepositions) परि , नि and वि and the verb.
Word by word (padaccheda)
Target सिवादीनाम् ṣaṣṭhī · bahuvacanaIndeclinable वा avyayaRight context अड्व्यवाये saptamī · ekavacanaIndeclinable अपि avyaya
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
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Full reading
सिवादीनाम् वा अड्व्यवाये अपि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The ष् change may take place optionally in the सिव् and the rest (of the last sūtra) even when the augment अ intervenes between the उपसर्ग (Prepositions) परि , नि and वि and the verb.
The सिवादि are the four roots सिव् सह, स्तु and स्वञ्ज, as well as the augment सुट् ॥ This is an example of ubhayatra-vibhasha. In the case of स्तु and स्वञ्ज् it is prapta-vibhasha, in the case of others it is aprapta. The examples have already been given under the preceding sutra, and so need not be repeated here.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.