The particle ūँ replaces uña in non-vedic literature and it is a pragṛhya in the opinion of śākalya,
Before the word इति the word ऊञ् is replaced sometimes by ऊँ the long nasal ū. Thus ऊँ+इति = ऊँ इति or विति.
In some authorities the sûtras 1.1.17 and 1.1.18 form but one sūtra, and then it is divided by the method of yoga-vibhága, the division of a single sūtra into two separate sûtras having two distinct rules.,