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Left-sorted Bongard Problems have the keyword "stretch" on the OEBP.
Right-sorted Bongard Problems have the keyword "stretchinvariant" on the OEBP.
If applying a scaling along one particular axis to the whole of any example can change its sorting the BP fits on the left side here. (For BPs with bounding boxes this means scaling and cropping, but without cutting out any detail.) | 
