8.3.57
इण्कोः
Heading adhikāra इण्कोः इत्यधिकारः
This is an अधिकार, which goes till the end of the पाद. The कार्य designated in this अधिकार happens for a स्थानी that follows an इण् letter or a letter from कवर्ग.
Word by word (padaccheda)
From / after इण्कोः pañcamī · ekavacana
- From / after Pañcamī (5th case): "from X" or "after X"; in headings, often the limit of their scope.
Full reading
इण्कोः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
From this, up to the end of the chapter should be supplied, in every sūtra, the following - 'when a vowel (with the exception of अ or आ) or a र् or a guttural precedes'.
The word इण is a pratyahara formed with the second ण् of लण् ॥ It includes all vowels and semivowels excepts अ and आ ॥ Of the semi-vowels र् is only efficient: so that only is taken in the translation. कु means the letters of the क class. Thus इण्कोः is supplied in 8.3.59, to complete the sense. Thus सिषेव, सुष्वाप, अग्निषु, वायुषु, कर्तृषु, हर्तृषु, गीर्षु, धूर्षु, वाक्षु, त्वक्षु ॥
Why do we say "when preceded by इण् or कु"? Observe दास्यति, असौ ॥ Here the affix स of स्यति, and the substitute स in असौ 7.2.106 are not changed to ष ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.