Five books are arranged on a shelf: Book A is to the left of Book B, Book C is to the right of Book A, and Book D is to the left of Book E. What is the possible order of the books?
A series of tasks were completed in the following order: Task 1, Task 2, Task 3, Task 4. Task 2 was completed after Task 1 but before Task 3. Task 4 was completed last. What is the sequence of tasks?