| PartialSortByTSource, TKey(IEnumerableTSource, Int32, FuncTSource, TKey) | Combines OrderByTSource, TKey(IEnumerableTSource, FuncTSource, TKey, IComparerTKey),
            and TakeTSource(IEnumerableTSource, Int32) in a single operation. | 
| PartialSortByTSource, TKey(IEnumerableTSource, Int32, FuncTSource, TKey, OrderByDirection) | Combines OrderByT, TKey(IEnumerableT, FuncT, TKey, OrderByDirection),
            and TakeTSource(IEnumerableTSource, Int32) in a single operation.
            An additional parameter specifies the direction of the sort | 
| PartialSortByTSource, TKey(IEnumerableTSource, Int32, FuncTSource, TKey, IComparerTKey) | Combines OrderByTSource, TKey(IEnumerableTSource, FuncTSource, TKey, IComparerTKey),
            and TakeTSource(IEnumerableTSource, Int32) in a single operation.
            An additional parameter specifies how the keys compare to each other. | 
| PartialSortByTSource, TKey(IEnumerableTSource, Int32, FuncTSource, TKey, IComparerTKey, OrderByDirection) | Combines OrderByT, TKey(IEnumerableT, FuncT, TKey, OrderByDirection),
            and TakeTSource(IEnumerableTSource, Int32) in a single operation.
            Additional parameters specify how the elements compare to each other and
            the direction of the sort. |