6.2.12
द्विगौ प्रमाणे
Operational rule vidhi
The first member of a तत्-पुरुष समास preserves its original accent when the second member is a द्विगु समास (Numeral Determinative Compound) denoting 'measure or quantity'.
Word by word (padaccheda)
Right context द्विगौ saptamī · ekavacanaRight context प्रमाणे saptamī · ekavacana
- 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
द्विगौ प्रमाणे
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Commentary
The first member of a तत्-पुरुष समास preserves its original accent when the second member is a द्विगु समास (Numeral Determinative Compound) denoting 'measure or quantity'.
Thus प्रा꣡च्यसप्तसमः and गा꣡न्धारिसप्तसमः ॥ The word सप्तसमः = सप्तसमाः प्रमाणमस्य, the affix मात्रच् denoting 'measure' 5.2.37 is elided (See 5.2.37 Vartika) प्राच्यश्चासौ सप्तमश्च = प्रा꣡च्यसप्तसमः "an Eastern seven-years old". So also गान्धा꣡रिसप्तसमः or षट्समः ॥ प्राच्य has acute on the first; while गान्धारि is either accented on the first or on the middle; as it belongs to the Kardamadi class (Phit III.10). Why do we say 'before a Dvigu'? Observe व्रीहिप्रस्थः ॥ Why do we say 'when denoting measure?' Observe परमसप्तसमः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.