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Left-sorted Bongard Problems have the keyword "stub" on the OEBP.
Right-sorted Bongard Problems have the keyword "finished" on the OEBP.
Users are not able to add or remove examples from Problems tagged "finished." (This is unusual; most Bongard Problems on the OEBP can be expanded indefinitely by users.)
A "finished" Bongard Problem will always admit the alternative, convoluted solution "is [left example 1] OR is [left example 2] OR . . . OR is [last left example] vs. is [right example 1] OR is [right example 2] OR . . . OR is [last right example]". | 
