बहुलं छन्दसि

Operational rule vidhi

इ is diversely substituted in the छन्दस् (Vedas) for the vowel of the reduplicate, in the Reduplicated Present-form.

Word by word (padaccheda)

Substitute / term बहुलम् prathamā · ekavacanaRight context छन्दसि 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

बहुलम् छन्दसि

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

Commentary

इ is diversely substituted in the छन्दस् (Vedas) for the vowel of the reduplicate, in the Reduplicated Present-form.
As पूर्णां विवष्टि (from वश्), जनिमा विवक्ति (from वच्), वत्सं न माता सिषक्ति (from सच्), and जिघर्ति सोमम् ॥ But also ददाति, जजनम्, दधनत् as in ददातीत्येवं ब्रूयात्; जजनमिन्द्रं माता यद्वीरं दधनद् धनिष्टा ॥ All these three roots belong to Juhotyadi class.

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