/Docs/G/ProseObject-Stack/Cmacc_1.md
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The notion of "first" is based on the File. The first Key in the File (reading down from the top) is the first. If there is no Key that matches, then referenced Files are searched, in the order they appear (reading from the top), recursively, depth-first. The match of a Key in a referenced File is, of course, based on the "prefixed" Key (see the next two items).