क्त्वि स्कन्दिस्यन्दोः

Operational rule vidhi

In presence of the क्त्वा प्रत्यय, the उपधा-नकार of the verb roots स्कन्द् and स्यन्द् is not removed.

Word by word (padaccheda)

Right context क्त्वि saptamī · ekavacanaTarget स्कन्दि- स्यन्दोः ṣaṣṭhī · dvivacana

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").
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

क्त्वि स्कन्दि-स्यन्दोः

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

Commentary

स्कन्दि and स्यन्द retain their nasal before the affix क्त।
Thus स्कन्त्वा, and स्यन्दित्वा or स्यन्त्वा, the इट् being added when स्यन्द is considered as having an indicatory ऊ in the dhatupatha. When इट् is added, क्त्वा is no longer कित् by virtue of the rule 1.2.18, and elision would not take place, for no rule of elision would apply in that case.

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