Sanskrit grants a very flexible syllable structure, where they may begin or end with vowels, be single consonants or clusters. Similarly, the syllable may have an internal vowel of any weight. Vedic Sanskrit shows traces of following the Sievers-Edgerton Law, but Classical Sanskrit doesn't. Vedic Sanskrit has a pitch accent system (inherited from Proto-Indo-European) states Jamison, which was acknowledged by Pāṇini, but in his Classical Sanskrit the accents disappear. Most Vedic Sanskrit words have one accent. However, this accent is not phonologically predictable, states Jamison. It can fall anywhere in the word and its position often conveys morphological and syntactic information. The presence of an accent system in Vedic Sanskrit is evidenced from the markings in the Vedic texts. This is important because of Sanskrit's connection to the PIE languages and comparative Indo-European linguistics.