The Sanskrit language cosmopolis thrived beyond India between and CE.
The red horizontal and vertical lines mark low and high pitch changes for chanting. William Jones remarked: The Sanscrit language, whatever be its antiquity, is of a wonderful structure; more perfect than the Greek, more copious than the Latin, and more exquisitely refined than either, yet bearing to both of them a stronger affinity, both in the roots of verbs and the forms of grammar, than could possibly have been produced by accident; so strong indeed, that no philologer could examine them all three, without believing them to have sprung from some common source, which, perhaps, no longer exists.
The language is extremely regular, almost mathematical in its grammar and formulation. The present-day Sanskrit is nothing more than the successful attempt to conserve the original language and to prevent its further alienation.
A Conjunct is composed of up to five consonants generally. All consonants of a Conjunct lack "a" except the last one. There are also some with four-consonant conjuncts and at least one well-known conjunct with five consonants. As a remarkable exception, even though the "la" may appear not to have a vertical stroke, it has.
In short, these vowels have no consonants previously. The differences between the Indian regional languages and Sanskrit are minuscule when compared to the differences between a Western language such as English and Sanskrit.