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879. The endings are the usual secondary ones

The general rules as to the strengthening of the root-vowel are these:

a. A final vowel (including ऋ ) has the vṛddhi-change in the active, and (excepting ऋ guṇa in the middle: thus, from √नी lead, active stem अनैष् anāiṣ, middle stem अनेष् aneṣ; from √श्रुçru hear, अश्रौष् açrāuṣ and अश्रोष् açroṣ; from √कृ kṛ make, अकार्ष akārṣ and अकृष् akṛṣ.

b. A medial vowel has the vṛddhi-change in the active, and remains unaltered in the middle: thus, from √छन्द chand seem, active stem अच्छान्त्स acchānts, middle stem अच्छन्त्सacchants; from √रिच् ric leave, अरैक्ष् arāikṣ and अरिक्ष् arikṣ; from √रुध् rudh obstruct, अरौत्स arāuts and अरुत्स aruts; from √सृज् sṛj pour out, अस्राक्ष् asrākṣ and असृक्ष् asṛkṣ.