Before the affixes 1. iṣṭha 2. iman and 3. īyas the last semi-vowel is elided with that which follows it and for the first vowel, a guṇa is substituted in 1. sthūla 2. dūra 3. yuvan 4. hrasva 5. kṣipra and 6. kṣudra,
That is ल, र, वन्, व, र, and र are elided. Thus स्थविष्ठः, स्थवीयान्; दविष्ठः दवीयान्; यविष्ठ, यवीयान्; ह्रसिष्ठः, ह्रसीयान्, ह्रसिमा; क्षेपिष्ठः, क्षपीयान्, क्षेपिमा ॥ The words ह्रस्व, क्षिप्र, and क्षुद्र are read in Prithvadi class and take 'iman' affix (V. I. 122). क्षोदिष्ठः, क्षोदायान्, क्षोदिमा ॥ Why do we say परं in यणादिपरं i.e. 'the last semi vowel'? The first semi-vowel of युवन् and ह्रस्व i.e. य of यु and र of ह्र should not be elided. The word पूर्व is employed for the sake of distinctness.,