8.4.44
शात्
Operational rule vidhi
A तवर्गीय letter following a शकार does not undergo श्चुत्वम्.
Word by word (padaccheda)
Left context शात् pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Full reading
शात्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In the room of तु there is not a palatal substitute, when श् precedes.
The words न and तोः are understood here. This is an exception to 8.4.40. Thus, प्रच्छ + न 3.3.90 = प्रश् + न 6.4.19 = प्रश्नः, विश्नः &c.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.