अञ्चेर्लुक्

Operational rule vidhi

After words of direction ending in अञ्च् there is लुक् elision of the affix अस्ताति.

Word by word (padaccheda)

Left context अञ्चेः pañcamī · ekavacanaSubstitute / term prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

अञ्चेः

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

Commentary

After words of direction ending in अञ्च् there is लुक् elision of the affix अस्ताति।
Thus प्राक् or प्रत्यक्; प्राच्यां दिशि वसति = प्राग् वसति, प्रागागतः, प्राग्रमणीयम् ॥ The feminine affix of प्राची is also elided, when the taddhita affix is elided by लुक् ॥ See (l. 2.49).

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