The affix śānac is the substitute of śnā after a root ending with a consonant, when hi follows.,
The affix हि is the 2nd person singular of लोट् or the Imperative mood. Thus पुषाण 'do thou nourish', गृहाण 'do thou take', from roots पुष् and ग्रह which end with consonants. But we have क्रीणीहि 'do thou buy'; here there is no substitution of शानच्, because the root ends with a vowel. The repetition of श्ना in the sutra shows that शानच् is a mere substitute and not an independent affix.,