stin̄noti, stin̄nuyāt (MS.; for stighn-), mṛnnīta (LÇS.; for mṛdn-), jān̄mayana (KS.; for jāgm-); these, however (like the double aspirates, 154a), are doubtless to be rejected as false readings.
162. Before l, a final t is not merely made sonant, but fully assimilated, becoming l: thus, tál labhate, úlluptam.
163. Before ह् h (the case occurs only in external combination), a final mute is made sonant; and then the ह् h may either remain unchanged or be converted into the sonant aspirate corresponding with the former: thus, either तद्हि tád hí or तद्धि tád dhí.
a. In practice, the latter method is almost invariably followed; and the grammarians of the Prātiçākhya period are nearly unanimous in requiring it. The phonetic difference between the two is very slight.
Examples are: vā́g ghutáḥ, ṣáḍḍhotā (ṣaṭ + hotā), taddhita (tat + hita), anuṣṭúb bhí.
Combinations of final स् s and र् r.
164. The euphonic changes of स् s and र् r are best considered together, because of the practical relation of the two sounds, in composition and sentence-collocation, as corresponding surd and sonant: in a host of cases स् s becomes र् r in situations requiring or favoring the occurrence of a sonant; and, much less often, र् r becomes स् s where a surd is required.
a. In internal combination, the two are far less exchangeable with one another: and this class of cases may best be taken up first.
165. Final r radical or quasi-radical (that is, not belonging to an ending of derivation) remains unchanged before both surd and sonant sounds, and even before su in declension: thus, píparṣi, caturthá, catúrṣu, pūrṣú.
166. Final radical s remains before a surd in general, and usually before s, as in çā́ssi, çāssva, āsse, āçī́ṣṣu (the last is also written āçī́ḥṣu: 172): but it is lost in ási (√as + si: 636). Before a sonant (that is, bh) in declension, it is treated as in external combination: thus, āçī́rbhis. Before a sonant (that is, dh) in conjugation, it appears to be dropped, at least after long ā: thus, çādhi, çaçādhi, cakādhi (the only quotable cases); in edhí (√as + dhi: 636) the root syllable is irregularly altered; but in 2d perss. pl., made with dhvam, as ādhvam, çādhvam, arādhvam (881 a), vadhvam (√vas
