आतो युच्

Operational rule vidhi

The affix युच् comes after the roots ending in long आ (when ईषद् and दुर् and सु are combined as उपपद-sūtras, in the sense of easily or with difficulty).

Word by word (padaccheda)

Left context आतः pañcamī · ekavacanaSubstitute / term यु prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

आतः युच्

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

Commentary

The affix युच् comes after the roots ending in long आ (when ईषद् and दुर् and सु are combined as उपपद-sūtras, in the sense of easily or with difficulty).
The word ईषद् &c. are to be read into this sutra, not so the words कर्तृकर्मणा &c. This supersedes the affix खल्. Thus ईषत्पानः सोमो भवता 'the soma juice can be lightly drunk by you'; दुष्पानः 'difficult to be drunk'; सुपानः 'easy to be drunk'. ईषद्दानो गौर्भवता 'the cow can be given with ease by you'; दुर्दानः सुदानः &c.

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