Sūtra 6·3·49
विभाषा चत्वारिंशत्प्रभृतौ सर्वेषाम्
vibhāṣā catvāriṃśatprabhṛtau sarveṣām
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The above substitution in the case of all (dvi, tri and aṣṭān), is optional, when the word catvāriṁśat and the numerals which follow it are the second member.
Padapāṭha vibhāṣā catvāriṃśatprabhṛtau sarveṣāmविभाषा चत्वारिंशत्प्रभृतौ सर्वेषाम्