Satyanarayana Dasa Babaji teaches Śrī Harināmāmṛta-vyākaraṇam, the Sanskrit grammar for vaiṣṇavas composed by Śrī Jīva Gosvāmī.
This course includes the seventh and final part of this grammar: the rules of taddhita.
This grammar is special because all technical terms are names of Kṛṣna. Thus, repeating the sūtras means repeating Kṛṣna's names.
Almost every sūtra has a corresponding sūtra in Pāṇinī's system and vice versa. However, to further ease our studies, Śrī Jīva arranged the sūtras according to topics and included also necessary rules which the commentators on Pāṇinī's system supplied.