यतोऽनावः

Operational rule vidhi

Whatever is formed by the affix यत् , has, if it is a disyllabic word, the acute on the first syllable, with the exception of नाव्यः from नौ.

Word by word (padaccheda)

Target यतः ṣaṣṭhī · ekavacanaLeft context अनावः pañcamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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

यतः अनावः

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

Commentary

Whatever is formed by the affix यत् , has, if it is a disyllabic word, the acute on the first syllable, with the exception of नाव्यः from नौ।
The word द्व्यच् is understood here from 6.1.205. Thus चे꣡यम्, जे꣡यम् 3.1.97; क꣡ण्ठ्यम्, ओ꣡ष्ठ्यम् 5.1.6. This rule debars the Svarita accent required by तित् 6.1.185 ॥ But नौ — नाव्य॑म् ॥ The rule does not apply to words of more than two syllables, thus :- चिकीर्ष्य॑म्, ललाट्य॑म् ॥

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