Paninian system that followed the central dialect preserved the distinction, likely out of reverence for the Vedic Sanskrit that distinguished the "r" and "l". However, the northwestern dialect only had "r", while the eastern dialect probably only had "l", states Masica. Thus literary works from different parts of ancient India appear inconsistent in their use of "r" and "l", resulting in doublets that are occasionally semantically differentiated. Consonants Sanskrit possesses a symmetric consonantal phoneme structure based on how the sound is articulated, though the actual usage of these sounds conceals the lack of parallelism in the apparent symmetry possibly from historical changes within the language. Sanskrit had a series of retroflex stops originating as conditioned alternants of dentals, albeit by Sanskrit they had become phonemic. Regarding the palatal plosives, the pronunciation is a matter of debate. In contemporary attestation, the palatal plosives are a regular series of palatal stops, supported by most Sanskrit sandhi rules. However, the reflexes in descendant languages, as well as a few of the sandhi rules regarding ch, could suggest an affricate pronunciation. jh was a marginal phoneme in Sanskrit, hence its phonology is more difficult to reconstruct; it was more commonly employed in the Middle Indo-Aryan languages as a result of phonological processes resulting in the phoneme. The palatal nasal is a conditioned variant of n occurring next to palatal obstruents. The anusvara that Sanskrit deploys is a conditioned alternant of postvocalic nasals, under certain sandhi conditions. Its visarga is a word-final or morpheme-final conditioned alternant of s and r under certain sandhi conditions. The voiceless aspirated series is also an innovation in Sanskrit but is significantly rarer than the other three series. While the Sanskrit language organizes sounds for expression beyond those found in the PIE language, it retained many features found in the Iranian and Balto-Slavic languages. An example of a similar process in all three is the retroflex sibilant ʂ being the automatic product of dental s following i, u, r, and k. Phonological alternations, sandhi rules Sanskrit deploys extensive phonological alternations on different linguistic levels through sandhi rules (literally, the rules of "putting together, union, connection, alliance"), similar to the English alteration of "going to" as gonna. The Sanskrit language accepts such alterations within it, but offers formal rules for the sandhi of any two words next to each other in the same sentence or linking two sentences. The external sandhi