स्यतासी लृलुटोः

Operational rule vidhi

In case of लृट् लकार and लृङ्लकार, the अङ्ग gets the विकरणप्रत्यय 'स्य'. In case of लुट्लकार, the अङ्ग gets the विकरणप्रत्यय तास्.

Word by word (padaccheda)

Substitute / term स्य- तासी prathamā · dvivacanaRight context लृलुटोः saptamī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

स्य-तासी लृलुटोः

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

Commentary

When ऌ and लुट् follow, then स्य and तासि are respectively the affixes of a verbal root
लृ is the common expression for लृङ् and लृट् formed by rejecting their special anubandhas, and means therefore the 2nd Future and the Conditional tenses. लुट् is the 1st Future also called the Periphrastic Future. Thus करिष्यति अकरिष्यत्, कर्ता. The इ of तासि is indicatory and shows that the nasal of the root is not to be dropped before this; as मन् 'to think', मन्ता 'he will think'.

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