As  ex owner of a board shop yes we made errors , and some times they got
out of the shop, its real easy to mix a layer up in the lamination stackup,
there can literly be hundreds of sheets of prepreg, spacers, packopads,
packothane and layers.  but no excuse, it just happens. the best idea is to
open a window as one person said its easy to see each layer, however at
anything above 6 layers it can get difficult. as a board manufacture I dont
like to see copper along a edge but the idea works , and is probably the
easiest for the assenmbler or user. robert tarzwell   megadawn.com

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