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**Essential Sutras**
The 26 study periods of the Dasha Shruta, Brihat Kalpa and Vyavahar Sutra -
Ten from the Dasha Shruta Skandha, six from the Brihat Kalpa and ten from the Vyavahar Sutra, transgression occurs from deviating from the study periods of these twenty-six studies and not acting according to them.
**Twenty-seven Qualities of an Ascetic**
Not properly following the twenty-seven qualities of an ascetic according to the scriptures is transgression. To purify oneself, there is the Pratikramana of the qualities of a Muni.
1. - 5. Properly observing the five great vows of Ahimsa, Satya, Asteya, Brahmacharya and Aparigraha, 6. Renunciation of night meals, 7. - 11. Controlling the five senses, 12. Purity of the inner self (Bhavasatya), 13. Karanasatya - properly recording clothes, vessels, etc., 14. Forgiveness, 15. Vitaragata - detachment, 16. Good inclination of the mind, 17. Good inclination of speech, 18. Good inclination of the body, 19. - 24. Protection of the six types of living beings, 25. Being virtuous, 26. Enduring pain like cold, etc., and 27. Enduring even a fatal attack with equanimity.
Acharya Haribhadra has described these twenty-seven qualities in his commentary on the Aavashyak Sutra, according to an ancient verse of the Sangrahani-kar. However, in the Samavayanga Sutra, the twenty-seven qualities of a Muni are mentioned slightly differently - five great vows, control of the five senses, renunciation of the four kshayas, Bhavasatya, Karanasatya, Yogasatya, forgiveness, detachment, mind-concentration, speech-concentration, body-concentration, knowledge-fullness, vision-fullness, virtue-fullness, endurance of pain, endurance of a fatal attack.
**Twenty-eight Achar Prakalpas**
There are different beliefs regarding the explanation of Achar Prakalpa. According to Acharya Haribhadra, Achar itself is called Achar Prakalpa - 'Achar ev Achar Prakalpa'.
The meaning of Achar is the first Anga Sutra. Its Prakalpa, i.e., special study, is called Nishita Sutra. Or, the Prakalpa, i.e., arrangement of knowledge, etc., of virtuous conduct is called Achar Prakalpa.
'Acharah Prathamaangam Tasy Prakalpah Adhyayanavishesho Nishitamittyaparabhidhanam. Acharasy Va Sadhvacharasya Jnanadivishaysya Prakalpo Vyavasthapanamiti Achar Prakalpah'
- Abhaydeva Samavayanga Sutra Commentary
There are twenty-five studies of the Acharanga Sutra, including Shastraparijna, and the Nishita Sutra is also a chapter of the Acharanga Sutra.