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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 1 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 means scaling an object appearing in a box within the bounding box.) | 
