वा लिटि

Operational rule vidhi

ख्याञ् is optionally the substitute of चक्षिङ् when लिट् (Perfect Tense) follows.

Word by word (padaccheda)

Indeclinable वा avyayaRight context लिटि saptamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

वा लिटि

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

Commentary

ख्याञ् is optionally the substitute of चक्षिङ् when लिट् (Perfect Tense) follows.
The लिट् also is an ardhadhatuka affix and by the last sutra ख्या would always have been the substitute of चक्ष्; the present sutra makes this substitution optional, as आचख्यौ, आचख्यतुः and आचख्युः. In the alterative we have आचचक्षे, आचचक्षाते and आचचक्षिरे 'he told &c.'

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