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Is a sorted set an ordered collection?
If you sort a List the sequence is destroyed. Thus it is not an ordered collection.
Normally, we think of linked lists as implementing a sequential arrangement of a set of items: Starting at a given node, we consider its item to be the first in the sequence. Then we follow its link to another node, which gives us an item that we consider to be the second in the sequence, and so forth. Robert Sedgewick, Algorithms in Java
we can choose to keep the lists in sorted order, or we can leave them unordered. Robert Sedgewick, Algorithms in Java