The affixes ktvā , kta and ktvātu always get the iṭ augment after vas 'to dwell' and kṣudh,
As उषित्वा, उषितः and उषितवान्, क्षुधित्वा, क्षुधितः, क्षुधितवान् ॥ The वस् of the Adadi class will get इट् as it is enumerated in the list of सेट् roots. The repetition of इट् shows that the rule is invariable, the 'optionally' of the preceding sutra does not affect it.,