ललितोपाख्याने जप-न्यास-योगप्रकरणम्
Lalitopākhyāna: Procedure of Japa, Nyāsa, and Yogic Installation
ह्रस्वाः पञ्चाथ सन्ध्यर्णाश्चत्वारो हयरा वलौ / अकौ खगेनगश्चादौ क्रमोयं शिष्टवर्गके
hrasvāḥ pañcātha sandhyarṇāścatvāro hayarā valau / akau khagenagaścādau kramoyaṃ śiṣṭavargake
The short vowels are five; the sandhi-letters are four; “haya-ra” is contained within “va-la”; and “a” and “ka” stand at the beginning along with “kha-ga-e-na-ga”—such is the sequence in the class laid down by the learned.