कंसमन्थशूर्पपाय्यकाण्डं द्विगौ

Operational rule vidhi

In a द्विगु समास (Numeral Determinative Compound) the following second members get acute accent (उदात्त) on their first syllable - 1. कंस 2. मन्थ 3. शूर्प 3. पाय्य and 4. काण्ड.

Word by word (padaccheda)

Substitute / term कंस- मन्थ- शूर्प- पाय्य- काण्डम् prathamā · ekavacanaRight context द्विगौ saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

कंस-मन्थ-शूर्प-पाय्य-काण्डम् द्विगौ

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

Commentary

In a द्विगु समास (Numeral Determinative Compound) the following second members get acute accent (उदात्त) on their first syllable - 1. कंस 2. मन्थ 3. शूर्प 3. पाय्य and 4. काण्ड।
Thus द्विकं꣡सः, (द्वाभ्यां कंसाभ्यां क्रीतः the affix टिठन् 5.1.25 is elided by 5.1.28) त्रिकं꣡सः, द्विम꣡न्थः, (the affix ठक् 4.1.19 is elided by 5.1.28) त्रिम꣡न्थः, द्विशू꣡र्पः, ( the affix अञ् 5.1.26 is elided) त्रिशू꣡र्पः, द्विपा꣡य्यः, त्रिपा꣡य्यः, द्विका꣡ण्डः, त्रिका꣡ण्डः ॥ Why do we say in a Dvigu? Observe परमकंसः, उत्तमकंसः ॥

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