A, B, C, D, and E are five books arranged on a shelf. The conditions are: A is to the left of B but to the right of C. D is to the right of E but to the left of A. Which book is in the middle position?
Four friends, Alice, Bob, Charlie, and David, are standing in line. Bob is in front of Alice but behind Charlie. David is at the back. What is the correct order from front to back?