After the negative particle, the final of the following is optionally acute accent (udātta) - a word formed with the affix tṛn and the words 1. anna 2. tīkṣṇa and 3. śuci,
Thus तृन् - अकर्त्ता꣡ or अ꣡कर्त्ता; अन्न &c - अनन्न꣡म् or अ꣡नन्नम्, अतीक्ष्ण꣡म्, or अ꣡तीक्ष्णम्, अशुचिः꣡ or अ꣡शुचिः ॥ The alternative accent is that of the Indeclinable. 6.2.2,