The ṣ change may take place optionally in the siv and the rest (of the last sūtra) even when the augment a intervenes between the upasarga (Prepositions) pari , ni and vi and the verb.,
The सिवादि are the four roots सिव् सह, स्तु and स्वञ्ज, as well as the augment सुट् ॥ This is an example of ubhayatra-vibhasha. In the case of स्तु and स्वञ्ज् it is prapta-vibhasha, in the case of others it is aprapta. The examples have already been given under the preceding sutra, and so need not be repeated here.,