ष्ठिवुक्लमुचमां शिति

Operational rule vidhi

Before any other Present character (शित्) the root vowel of 1. ष्ठिव् 2. क्लम् and 3.आ-चम् is lengthened.

Word by word (padaccheda)

Target ष्ठिवु- क्लमु- चमाम् ṣaṣṭhī · bahuvacanaRight context शिति saptamī · ekavacana

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

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Full reading

ष्ठिवु-क्लमु-चमाम् शिति

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

Commentary

Before any other Present character (शित्) the root vowel of 1. ष्ठिव् 2. क्लम् and 3.आ-चम् is lengthened.
As ष्ठीवति, क्लामति, and आ चामति ॥ क्लम् lengthens its vowel before श्यन् by the last rule, the present rule produces this change before the affix शप् also, which it gets by 3.1.70. चम् lengthens its vowel only when it is preceded by आ; therefore not here: चमति, विचमति or उचमति ॥ The sutra is exhibited as ष्ठिवुक्लमु चमां शिति in the original text of Panini; the present form, owes its existence to the insertion of आ from the vartika दीर्घत्वमाङि चमः ॥

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