the criterion is ambiguous/or even empty: one could always be conformant to this by saying that the set of web resources consists merely of the webunits that share the same order. So if on my website I put the same 5 links in different orders within the pages, they are still ok with 323, because each web page makes its own set of webunits.
We have revised this success criterion to reference a "set of Web pages" and have included a definition for that term:
set of Web pages:
collection of Web pages that have a specific relationship to each
other and that are created as a body of work by an author, group or organization.
Note: Different language versions would be considered different bodies of work.
Examples: A set of Web pages that make up a report, a test, an exercise, a catalog, or an application.