Praudhamanorama p112

p112

[On] ṅṇoḥ (Pā. sū. 8.3.28): Because kuk and ṭuk are initial augments of the preceding element, in prāṅksāye the retroflexion of s by "sātpadādyoḥ" does not occur. In sugaṇṭsāye, the retroflexion of dental consonants by "na padāntāt—" (Pā. sū. 8.4.42) does not occur.
One who sits in Puṣkara, a particular holy pilgrimage place, is a puṣkarasat; his descendant is the teacher Pauṣkarasādi. The suffix iñ [is added] on account of being in the bāhvādi class. On account of being in the anuśatikādi class, there is vṛddhi of both members of the compound.