dviḥ", "triḥ" and "catuḥ" playing the role of adverbs showing frequency + a hard guttural or labial consonant = ṣ + a hard guttural or labial consonant or else "no change" (this is optional)
dviḥ", "triḥ" and "catuḥ" playing the role of adverbs showing frequency + a hard guttural or labial consonant = ṣ + a hard guttural or labial consonant or else "no change" (this is optional)