First Śiva Sūtra: contains the three short vowels a, i, u (with the marker ṇ). When read with the following sūtras, "aiuṇ" = pratyāhāra "ak" = all vowels. Pāṇini's grammar is built on 14 Śiva Sūtras that encode all Sanskrit phonemes in a special order — revealed, according to tradition, by Śiva's ḍamaru at the end of his cosmic dance.