In a process that sequentially ranks a set of five items {A, B, C, D, E}, the final observed ranking is C > A > E > B > D. At each step k, a selection is made from the set of items that have not yet been ranked, denoted as $\mathring{Y}_{\ge k}$. What are the elements of the set $\mathring{Y}_{\ge 3}$?

Relationship Between Consecutive Sets in Sequential Ranking

Consider a sequential process that ranks a set of four documents {D1, D2, D3, D4}, resulting in the final ranked list: D3 > D1 > D4 > D2. The notation $\mathring{Y}_{\ge k}$ represents the set of items available for selection at step k. The statement is: The set of items available at step 3, $\mathring{Y}_{\ge 3}$, is {D2}.