विभाषा द्वितीयातृतीयाभ्याम्

Operational rule vidhi

A ङित्-प्रत्यय that comes after the words द्वितीया and तृतीया optionally get a स्याट् आगम, and अङ्ग becomes ह्रस्व when such an आगम happens.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaLeft context द्वितीयातृतीयाभ्याम् pañcamī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

द्वितीयातृतीयाभ्याम्

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

Commentary

After द्वितीया and तृतीया the Dative -4th Case, Ablative -5th case and Genitive 6th-Case singular may optionally get the augment स्याट् before which the आ of the अङ्ग (stem) is shortened.
As द्वितीयस्यै or द्वितीयायै, तृतीयस्यै or तृतीयायै, द्वितीयस्याः or द्वितीयायाः, तृतीयस्याः or तृतीयायाः ॥

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