Sūtra 4·3·24
विभाषा पूर्वाह्णापराह्णाभ्याम्
vibhāṣā pūrvāhṇāparāhṇābhyām
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Optionally after the words pūrvāhṇa and aparāhṇa, there are the affixes ṭyu and ṭyul and their augment is tuṭ
Padapāṭha vibhāṣā pūrvāhṇaaparāhṇābhyāmविभाषा पूर्वाह्णअपराह्णाभ्याम्