* Start with the clues:
* "Book c lies above d" - This means book 'd' is below book 'c'.
* "E is below a" - This means book 'e' is below book 'a'.
* "b is above a" - This means book 'a' is below book 'b'.
* Combine the clues: We know 'd' is below 'c', and 'e' is below 'a', which is below 'b'.
* The bottom book: Since 'e' is below 'a', which is below 'b', and there are no other books below 'e', book 'e' is at the bottom.