UḍḍT, 8, 12.1 śatrumitrodāsīnasādhyasiddhasya lakṣaṇam /

UḍḍT, 8, 12.3 tṛtīyavargasya yadā bhavati tadā sādhyaḥ caturthavargākṣaro bhavati tadodāsīnaḥ pañcamavargākṣaro yadā bhavati tadā śatrur jñātavyaḥ /