In a set of five colors: Red, Blue, Green, Yellow, and Orange, Red is brighter than Blue but darker than Green. Yellow is brighter than Orange but darker than Blue. Which color is the darkest?
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?