Optionally after the words 1. pūrvāhṇa and 2. aparāhṇa there are the affixes ṭyu and ṭyul and their augment is tuṭ,
In the alternative ठञ् of 4.3.11 also occurs. As पूर्वाह्णेत꣡नम्, अपराह्णे꣡तनम् with tyu, or पौ꣡र्वाह्णिकम् आ꣡पराह्णिकम् with than. With tyul, we have पूर्वाह्णेत꣡नं and अपराह्णेत꣡नं ॥ The sign of the locative is not elided by rule 6.3.17. When the word is taken as incapable of having the case-affix, we have, पूवाह्णत꣡नं or पूर्वाह्ण꣡तनः ॥,