यथाविध्यनुप्रयोगः पूर्वस्मिन्

Operational rule vidhi

In the first case -- क्रियासमभिहारे लोट्, लोटो हिस्वौ, वा च तध्वमोः (3.4.2) the same verb must be used in the subsequent clause, as the verb which was put in the लोट् (Imperative Mood) .

Word by word (padaccheda)

Indeclinable यथाविधि avyayaSubstitute / term अनुप्रयोगः prathamā · ekavacanaRight context पूर्वस्मिन् saptamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

यथाविधि अनुप्रयोगः पूर्वस्मिन्

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

Commentary

In the first case -- क्रियासमभिहारे लोट्, लोटो हिस्वौ, वा च तध्वमोः 3.4.2 the same verb must be used in the subsequent clause, as the verb which was put in the लोट् (Imperative Mood) .
The examples have already been given under sutra 3.4.2. We cannot say लूनीहि लुनीहीत्येवायं छिनत्ति; we must use a verb from the root लू 'to cut'. Such as लुनाति, &c. So also अधीष्वाधीष्व takes अधोते only after it and not a synonymous verb like पठति &c.

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