5.3.77 नीतौ च तद्युक्तात्

Word by word (padaccheda)

Right context नीतौ saptamī · ekavacanaIndeclinable च avyayaLeft context तद्युक्तात् pañcamī · 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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

नीतौ च तद्युक्तात्

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

Commentary

Also as an expression of courteousness, the above mentioned affix is added to that by which compassion is shown.
The word नीति means 'policy' or 'expedient', such as 'conciliation', 'dissension' and 'punishment'. तद्युक्तात् means 'joined with that, i.e. with gift compassion'. In other words, the things signified by the bases, are connected as means of relief with the persons or things that have been objects of compassion. Thus, हन्त ते धानकाः 'alas! here are barley for you'. हन्त ते तिलकाः 'alas! here are sesamun for you'. एहकि, अद्धकि 'O dear! come and eat'. (These words are supposed to be addressed to a person who is starving, by one who wants to relieve him. Iyengar). Being moved with compassion, he entreats coursteously the object of sympathy, with gifts to relieve his want. In the last Sutra, the affix was added, in the sense of compassion, to the name of the person or action that evoked pity. In the present sutra, the affix is added to the object or action by which pity is shown. The word एहकि is from एहि the Imperative second person Singular of इ 'to go' with the upasarga आ ॥

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