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Rules apply across-the-board (ATB) if they may affect all conjuncts in a coordinate structure at the same time.
Wh-movement applies across-the-board in:
I wonder which booksi [Mary hates ei]C1 and [Sam likes ei]C2
In this case wh-movement has extracted the parallel wh-phrase which books out of both conjuncts C1 and C2. ATB extraction is the single exception to the CSC.
Utrecht Lexicon of Linguistics
Williams, E. 1978. Discourse and Logical Form. Linguistic Inquiry 8-1, 101-139.