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Left examples have the keyword "pixelperfect" on the OEBP.
All examples here are perfect Bongard Problems. That is, subtle imperfections in images are meant to be considered.
When a Problem is tagged with "pixelperfect", users are reminded to make sure they do not upload images such that taking the pixelation into account would affect the sorting of that example. That is, the zoomed-in jagged blocky version of the picture should still fit the solution.
For example, in the examples of BP335, which is about tessellation, the pixels interlock properly. | 
