1.3.16
इतरेतरान्योन्योपपदाच्च
Operational rule vidhi
A verb does not get the प्रत्ययाः of आत्मनेपद in the कर्तरि प्रयोग, in the context of व्यतिहार (exchange of actions) when either of the words 'इतरेतर' or 'अन्योन्य' is used to describe the situation.
Word by word (padaccheda)
Left context इतरेतर- अन्योन्य- pañcamī · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
इतरेतर-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
And after the verbs which take the words इतरेतर 'each other' and अन्योन्य 'one another', as उपपद (or dependant qualifying words), the affixes of आत्मनेपद are not used, though reciprocity of action be denoted.
Thus इतरेतरस्य व्यति लुनन्ति 'they cut each other' अन्योन्यस्य व्यतिलुनन्ति 'they cut one another.'
Vart:- This rule must also be applied when the word परस्पर is in composition with the verb, as an upapada. As परस्परस्य व्यतिलुनन्ति.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.