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1. Find the last element of a list
2. Find the penultimate element of a list
3. Find the element at N of a list. First element is 1
4. Find the length of a list
5. Reverse a list
6. Find out if a list is a palindome
7. Flatten a nested list structure
8. Eliminate consecutive duplicates of list elements
9. Pack consecutive duplicates of list elements into sublists
10. Run-length encoding
11. Modified run-length encoding
12. Decode run-length encoding
13. Run-length encoding direct
14. Duplicate the elements of a list
15. Replicated the elements of a list n times
16. Drop every nth item from a list
17. Split a list into two parts, first part given length
18. Extract a slice from the list
19. Rotate a list n places to the left
20. Returns a list without the nth item