The words formed by those kṛt or primary affixes -- kṛdatiṅ [[3.1.93]], which end with a m or in a e , o , ai and au are also avyaya or indeclinables.,
All affixes for the formation of nouns are of two kinds:-1. Those by which nouns are derived directly from roots: Primary affixes. 2. Those by which nouns are derived from other nouns: Secondary affixes. The former are called krit, the latter, taddhita.
Words formed by krit affixes which end in म or ए, ओ, ऐ, or औ (connoted by the pratyahara एच्) are avyayas. Thus the affix तुम् (technically तुमुन्) and अम् (technically णमुल्, 3.3.10) are affixes which end in म्. The words formed by the addition of these affixes will be indeclinables. Thus दातुम् 'to give,' and स्मारम् 'remembering' are avyayas. So also words like जीवसे 'to live,' पिवध्यै 'to drink,' are also avyayas as they end in ए, &c.
Thus, in the following examples, the words within quotation are avyayas 'स्वादुंकारं,' 'संपन्नंकारं,' 'लवणंकारं,' भुङ्क्ते, 'he eats first having made it relishing' 3.4.26. \वक्षे\ रायः ( वच् + से 3.4.9 = वक्षे ); ता 'वामेषे,' रथनामुर्वीम् गव्युतिमेषां ( इ + से = एषे. Rig _Veda V. 66. 3). अस्मे शतं शरदो 'जीवसे' धा अस्मे वीराञ्छ्श्वत इंद्र शिप्रिन् (Rig _Veda III. 36. 10). आपः पृणीत भेषजं वरूथं तन्वे मम । ज्योक् च सूर्य्यं 'दृशे,' (Rig _Veda I. 25. 21, दृश् + केन् III. 4. II दृशे).
The word अन्त is used in this sutra for the same purpose, as it was employed in sutra 1.1.24, showing that these terminations must be 'aupadesika,' and not derivative. Therefore the following words are not avyayas:-- आधये (d, s.), आधेः (g.s.) चिकीर्षवे । चिकीर्षोः । कुम्भकारेभ्यः । नगरकारेभ्यः ॥,