- 01 to 10: lists
- 11 to 20: lists, continued
- 21 to 28: lists again
- 31 to 41: arithmetic
- 46 to 50: logic and codes
- 54 to 60: binary trees
- 61 to 69: binary trees, continued
- 70 to 73: multiway trees
- 80 to 89: graphs
- 90 to 94: miscellaneous problems
- 95 to 99: miscellaneous problems, continued