वैवावेति च च्छन्दसि

Operational rule vidhi

Also in connection with वै and वाव , may optionally, in the छन्दस् (Vedas), the first verb retains its accent.

Word by word (padaccheda)

Word वैवाव Indeclinable avyayaIndeclinable च avyayaRight context छन्दसि saptamī · ekavacana

Word Case not marked in the source data.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

वैवाव च छन्दसि

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

Commentary

Also in connection with वै and वाव , may optionally, in the छन्दस् (Vedas), the first verb retains its accent.
Thus अहर्वै देवानाम् आ꣡सीत् (or आसी॒त्), रात्रिरसुराणाम् आसीत् ॥ बृहस्पति र्वै देवानां पुरोहित आ꣡सीत् (or आसी॒त्), शण्डामर्कावसुराणां (Taittariya Sanhita VI.4.10, I.but with out the particle वै). अयं वाव हस्त आ꣡सीत् (or आसी॒त्), नेतर आसीत् ॥

वै has the force of स्फुट and क्षमा, and वाव that of प्रसिद्धि and स्फुट ॥

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