Five tasks P, Q, R, S, and T need to be completed. Task P must be completed before Q, and R must be completed before S. Task T can be done at any time. What is a possible sequence of completing the tasks?
Five books are arranged on a shelf. Book A is to the left of Book B but to the right of Book C. Book D is to the right of Book E but to the left of Book A. What is the sequence of the books from left to right?
In a race, the following positions were recorded: A finished before B, C finished after D, and E finished last. What is the correct order of finishers?