Praudhamanorama p7

p7

The original enunciation of the sound h in "ha-ya-va-ra-ṭ" (Māheśvarasūtra 5) is for the purpose of including the sound h in the abbreviatory designations aṭ, aś, haś, and iṇ: [for instance,] the retroflexion of n by [Pāṇini's rule] "aḍvyavāye 'pi" in arheṇa; the substitution of y for ru by "bho-bhago-" in devā hasanti; the substitution of u by "haśi ca" in devo hasati; the optional substitution of ḍh by "vibhāṣeṭaḥ" in lilihiḍhve / lilihidhve. This rule "hal" is for the purpose of including the sound h in [the abbreviatory designations] val, ral, jhal, and śal: the augment iṭ marked by an initial consonant belonging to val by "rudādibhyaḥ sārvadhātuke" in rudihi and svapihi; the optional status of having k as a marker by "ralo vyupadhād-" in snihitvā and snehitvā; the elision of s by "jhalo jhali" in adāgdhām; [and the affix] ksa by "śala igupadhāt" in alikṣat.
halantyam (Pāṇini 1.3.3).