In the chandas , the semi-vowel of this root is diversely vocalised.,
Thus हुवे or ह्वयामि, as इन्द्राग्नी हुवे 'Invoke Indra and Agni'. देवीं सरस्वतीं हुवे ॥ The form हुवे is Atmanepada, Present tense, Ist Person singular the vikarana शप् is elided, then there is vocalisation and substitution of उवङ् ॥ So also ह्वयामि मरुतः शिवान्, ह्वयामि विश्वान् देवान् ॥ So also हवः as श्रुधीहवम् (Rig I. 2. 1.) 'hear the invocation'.,