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10. The **Vyavahar Sutra** (3) in the fifth **uddeshak** has a provision for **prāyaścitta** (penance) for young **sadhus** and **sadhvis** who forget the **prācārpraklap** study. Thus, the **Vyavahar Sutra** mentions **mācārpraklap** or **prācārpraklap-adhyayan** a total of sixteen times, namely - once each in **uddeshak** sutra 3, 10, 17, 21, 22, 23, twice each in 15, 16, 18, 17, 18. The **Nandi Sutra** lists the names of 71 **āgamas** in the **kālik** and **utkālik** sutras. None of them mention any sutra named **prācārpraklap** or **prācārpraklap-adhyayan**. Therefore, it becomes necessary to understand and consider for which sutra this **prācārpraklap** is designated and how its name has changed due to the change in time. In this regard, the views of the **vyākhyākar** (commentators) and **pūrvaācāryas** (ancient teachers) are found as follows: (1) **Pañcavihe āyarappakappe paṇṇatte**, **taṁ jaha** - 1. **māsiē ugghaie**, 2. **māsiē aṇugdhaie**, 3. **cāumāsiē ugghaie**, 4. **cāumāsiē aṇugdhaie**, 5. **pārovana**. **Toka ācārasya prathamāṁgasya padavibhāgasamācārīlakṣaṇaprakṛṣṭakalpābhidhāyakatvāt praklapāḥ ācārpraklapāḥ niśīthādhyayanam / sa ca pañcavidhaḥ, pañcavidhaprāyaścittābhidhāyakatvāt. - **Ṭhāṇāṁga**. A. 5 (2) **Ācāraḥ prathamāṁgaḥ**, **tasya praklapāḥ adhyayanaviśeṣāḥ**, **niśītham iti aparābhidhānasya /** - **Samavāyāṁga**. 28 (3) **Aṣṭāviṁśatividhaḥ prācārpraklapāḥ niśīthādhyayanam ācārāṁgam ity arthaḥ / sa ca evaṁ (1) satyaparīṇṇā jāva (25) vimutti, (26) ugdhaie, (27) aṇugdhaie (28) prārōvaṇā tivihamo niśīhaṁ tu, iti aṭṭhāviśaviho pāyarappakappanaṁmo tti**. - **Rājendra Kośa Bhā**. 2, p. 349, "**āyarappakappa**" śabda / - **Praśnavyākaraṇa Sutra** A. 10. (4) **Ācāraḥ prācārāṁgam, praklapāḥ-niśīthādhyayanam, tasya eva pañcamaculā / ācāreṇa sahitaḥ praklapāḥ ācārpraklap, pañcaviṁśati adhyayanātmakatvāt pañcaviṁśatividhaḥ ācāraḥ, 1. ugdhatimaṁ, 2. anugdhatimaṁ 3. ārovana iti tridhā praklapōmilane aṣṭāviṁśatividhaḥ**. - **Abhi. Rā. Ko.** Bhāga 2 p. 350, '**pāyarappakappa**' śabda Here, the original text of **Samavāyāṁgasutra** and **Praśnavyākaraṇasutra** mentions twenty-eight types of **prācārpraklap**, which includes 25 studies of the entire **pācārāṁgasutra** and the **niśīthasutra**.