6.4.68
वाऽन्यस्य संयोगादेः
Operational rule vidhi
For the final आ of any other root than those mentioned in घुमास्थागापाजहातिसां हलि (6.4.66), ए may optionally be substituted in the Benedictive active, when the root begins with a conjunct consonant.
Word by word (padaccheda)
Indeclinable वा avyayaTarget अन्यस्य ṣaṣṭhī · ekavacanaTarget संयोगादेः ṣaṣṭhī · ekavacana
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
वा अन्यस्य संयोगादेः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
For the final आ of any other root than those mentioned in घुमास्थागापाजहातिसां हलि 6.4.66, ए may optionally be substituted in the Benedictive active, when the root begins with a conjunct consonant.
The स्था was the only root of 6.4.66, which could have been affected by this rule. It has been, however, specially exempted by the word अन्यस्य ॥ Thus ग्लेयात् or ग्लायात्, म्लेयात् or म्लायात्, but only स्थेयात् 6.4.66, and यायात् (not commencing with a double consonant). The phrase क्ङिति is understood here and therefore the rule applies to Parasmaipada affixes 3.4.104. Thus ग्लासिष्ट in Atmanepada. The root considered as an anga, should consist of a double consonant, therefore in निर्वायात् (from निर् + वा), र्व is not to be considered as a root having a double consonant, for र is no part of the anga, but of the preposition.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.