1. anti-

2. against

3. un-

4. not

5. non-

6. not

7. bi-

8. two

9. tri-

10. three

11. pre-

12. before

13. de-

14. down; away from

15. dis-

16. away-

17. con-

18. together

19. com-

20. together

21. circum-

22. around

23. inter-

24. between

25. intra-

26. within

27. intro-

28. into

29. sym-

30. together

31. syn-

32. together

33. mis-

34. bad

35. tri-

36. three

37. non-

38. not

39. post-

40. after

41. mal-

42. bad

43. semi-

44. half

45. super-

46. over

47. post-

48. after

49. sub-

50. under