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Left-sorted problems have the keyword "finishedexamples" on the OEBP.
The addition does not have to be slight.
Left-sorted Problems usually have a very specific collection of examples, where the only images sorted all show the same type of object.
Any Bongard Problem where all examples are one shape outline will be sorted left, and (almost) any Bongard Problem where all examples are one fill shape will be sorted right. | 
