These two - śatṛ and śānac are called sat.,
These participial affixes get collectively this name; and as such they are not limited by the conditions enumerated above; so that they replace not only the affixes of the Present tense but sometimes of Future also (III. 3. 14.), as well as other tenses. Thus ब्राह्मणस्य कुर्वन्, करिष्यन्, कुर्वाणः, करिष्यमाणः ।
The word सत् occurs in sutra (II. 2. 11.) &c.,