. . .
Left-sorted Bongard Problems have the keyword "nice" on the OEBP.
Right-sorted Bongard Problems have the keyword "less." They are not necessarily "bad," but we do not want more like them.
Adjacent-numbered pages: BP498 BP499 BP500 BP501 BP502  *  BP504 BP505 BP506 BP507 BP508
subjective, meta (see left/right), links, keyword, oebp, right-finite, left-it, feedback, time
bp [smaller | same | bigger]
Aaron David Fairbanks
Adjacent-numbered pages: BP619 BP620 BP621 BP622 BP623  *  BP625 BP626 BP627 BP628 BP629
meta (see left/right), links, metaconcept
Harry E. Foundalis
Alternatively, BP pages on the OEBP with number less than or equal to 394 vs. other BP pages.
https://www.foundalis.com/res/bps/bpidx.htm
Adjacent-numbered pages: BP1189 BP1190 BP1191 BP1192 BP1193  *  BP1195 BP1196 BP1197 BP1198 BP1199
Foundalis's collection includes all Bongard Problems by Bongard.
meta (see left/right), links, right-self, time