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(F) Cards with hidden markings

These playing cards, produced in China in 2003 show the application of a Stereogram. The illustration shows the playing card with a hidden pattern on the back, a different pattern being hidden for all cards in the pack. You just look at random points in the middle of the card and after a while the markings will appear. It takes a little practice but it is not too difficult.
Try it, you should see the following three hidden numbers and patterns.


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