From Eric Baković:
A paper of mine that was just published included the following sentence in the abstract, helpfully "corrected" by an overzealous copy-editor:
The focus [of this chapter] is on two main goals of phonological description and analysis: the establishment of generalizations about which members of a set of posited phonological constituents are irreducibly basic and that are derived, and the establishment of generalizations about the contexts in which phonological constituents are and are not found.
Interestingly, virtually the same sentence is repeated in the introduction, with "which are derived" intact.
In the published context:
Value added, my ass.