5.4.94
अनोऽश्मायस्सरसाम् जातिसंज्ञयोः
Operational rule vidhi
The affix टच् comes after 1. अनस् 2. अश्मन् 3. अयस् and 4. सरस् when at the end of a तत्-पुरुष समास it denotes a genus or a name.
Word by word (padaccheda)
Target अनः- अश्म- अयस्- सरसाम् ṣaṣṭhī · bahuvacanaRight context जाति- संज्ञयोः saptamī · dvivacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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
अनः-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix टच् comes after 1. अनस् 2. अश्मन् 3. अयस् and 4. सरस् when at the end of a तत्-पुरुष समास it denotes a genus or a name.
Thus उपानसम्, अमृताश्मः, कालायसम्, and मण्डूकसरसम् are examples of जाति words, while महानसम्, पिण्डाश्मः, लोहितायसम्, and जलसरसम् are examples of संज्ञा ॥
Why do we say "when meaning a jati or a sanjna ?" Observe, सदनः, सदश्माः, सत्सरः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.