अतो हेः

Thus पच, पठ, गच्छ, धाव ॥ But युहि, रुहि after stems ending in उ. Why do we say \short अ\? Observe लुनीहि, पुनीहि (लुना + हि, the ई substitution by 6.4.113, should be considered asiddha), here हि is not elided after the long आ ॥,