5.3.51
मानपश्वङ्गयोः कन्लुकौ च
Operational rule vidhi
After the words 1. षष्ठ and 2. अष्ठम there may come respectively कन् (क) and लुक् elision of the affix when the meaning is a division of a measure called मान or grain or the part of the body of a beast respectively.
Word by word (padaccheda)
Right context मान- पश्वङ्गयोः saptamī · dvivacanaSubstitute / term कन्लुकौ prathamā · dvivacanaIndeclinable च avyaya
- 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").
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
मान-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the words 1. षष्ठ and 2. अष्ठम there may come respectively कन् (क) and लुक् elision of the affix when the meaning is a division of a measure called मान or grain or the part of the body of a beast respectively.
The word मान means a grain weight (व्रीहि परिमितं सुवर्ण). That is to say, कन् comes after षष्ठ when a division of मान 'measure' is expressed; and लुक् comes after अष्ट when a part of पश्वङ्ग is denoted. Thus ष꣡ष्ठको भागः 'a sixth of a grain measure'. अष्टमो भागः 'an-eighth part of the body of a beast'. The लुक् here takes the place of the affix ञ as well as अन् ॥ By च, the affixes above mentioned are also employed: as षाष्ठः or षष्ठः, आष्टमः or अष्टमः ॥ When a measure or the body of an animal is not denoted, this rule (though optional) will not apply.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.