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"Sun trained herself to identify aberrations along the left or right margins of the card backs, no wider than 1/32 of an inch"

That is insanely impressive. Anyone have an example of what these look like?

Unfortunately I couldn't find those specific cards, but there's an example here [1] explaining how the system works.

http://www.casinotop10.net/edge-sorting has a pictures of the Borgata / Gemaco cards.