6.4.121
थलि च सेटि
Operational rule vidhi
ए is substituted for अ of a verbal अङ्ग (stem) standing between two simple consonants, the अङ्ग (stem) not having any different letter substituted in the reduplicate when the ending थल् of the लिट् (Perfect Tense) having the augment इट् follows and thereby the reduplicate is elided.
Word by word (padaccheda)
Right context थलि saptamī · ekavacanaIndeclinable च avyayaRight context सेटि saptamī · ekavacana
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
थलि च सेटि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
ए is substituted for अ of a verbal अङ्ग (stem) standing between two simple consonants, the अङ्ग (stem) not having any different letter substituted in the reduplicate when the ending थल् of the लिट् (Perfect Tense) having the augment इट् follows and thereby the reduplicate is elided.
Thus पेचिथ, शेकिथ ॥ But पपक्थ before anit थ; दिदेविथ, the vowel being इ and not अ; ततक्षिथ, ररक्षिथ, the अ not standing between two simple consonants; and चकणिथ, बभणिथ, the reduplicate having the substitutes च and ब different from क and भ ॥ This sutra applies even when the affix is not कित्; and थल् is read in the sutra only for the sake of clearness, no non-kit Perfect ending can take इट् except थल् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.