Across-the-Board

Rules apply across-the-board (ATB) if they may affect all conjuncts in a coordinate structure at the same time.

Example
Wh-movement applies across-the-board in:

I wonder which booksi [Mary hates ei]C1 and [Sam likes ei]C2

Comments
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.

Link
Utrecht Lexicon of Linguistics