वसतिक्षुधोरिट्

Operational rule vidhi

The affixes क्त्वा , क्त and क्त्वातु always get the इट् augment after वस् 'to dwell' and क्षुध्.

Word by word (padaccheda)

Target वसतिक्षुधोः ṣaṣṭhī · dvivacanaSubstitute / term इट् prathamā · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

वसतिक्षुधोः इट्

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

As a rewrite rule (sketch from case endings)

वसतिक्षुधोः → इट्

Replace vasatikṣudhoḥ with iṭ. Inherited words (anuvṛtti) may add further conditions.

Commentary

The affixes क्त्वा , क्त and क्त्वातु always get the इट् augment after वस् 'to dwell' and क्षुध्।
As उषित्वा, उषितः and उषितवान्, क्षुधित्वा, क्षुधितः, क्षुधितवान् ॥ The वस् of the Adadi class will get इट् as it is enumerated in the list of सेट् roots. The repetition of इट् shows that the rule is invariable, the 'optionally' of the preceding sutra does not affect it.

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