Praudhamanorama p69

p69

Although chandasi is not under discussion, nonetheless, from the sequence beginning with "yajuṣyuraḥ" (Pā. Sū. 6.1.117), one might suppose that this applies only in Vedic; therefore it is said: sarvatra. He explains that: "in the ordinary language and in the Veda". Here, continuing "eṅaḥ", it must be explained: of [the word] go ending in eṅ. Therefore it does not apply here: citragvagram. Because of the mention of eṅ that is explicitly taught (pratipadokta), it does not apply here: he citrago'gram. Regarding "absence of sandhi-change (prakṛtibhāva)": because of the continuation of prakṛtyā from the rule "prakṛtyāntaḥ pādam" (Pā. Sū. 6.1.115). Although in the Mahābhāṣya on the rule "iko guṇavṛddhī" (Pā. Sū. 1.1.3) the reading "nāntaḥ padam" is established, and likewise in the Mahābhāṣya on the sixth chapter, nonetheless, because of the Mahābhāṣya statement on the Śākala rule, "by the 'ca' in 'hrasvaśca', 'prakṛtyā' is drawn back", the reading "prakṛtyāntaḥ pādam" is also quite correct. However, if the reading is "na", it should be observed that by the rule "sarvatra", single substitute for preceding element (pūrvarūpa) alone would be made optional.
avaṅ sphoṭāyanasya (Pā. Sū. 6.1.123)