Nineteen Confrontations of The Platform Sutra:
1. the incorrect and the correct, 2. ignorance and wisdom, 3. stupidity and knowledge, 4. confusion and samadhi, 5. following the precepts and not following them, 6. straight and crooked, 7. real and unreal, 8. steep and level, 9. passions and enlightenment, 10. compassion and harm, 11. joy and anger, 12. giving and begrudging, 13. progressing and retrogressing, 14. birth and destruction, 15. permanence and impermanence, 16. the Dharmakaya and the physical body, 17. the Nirmanakaya and the Sambohogakaya, 18. substance and function, 19. nature and characteristics.