Left-sorted Bongard Problems have the keyword "testexample" on the OEBP.
BP517 ("sorts self left vs. sorts self right") does not quite fit left; it is about the sorting of a specific example, but a different example for every Bongard Problem.
testexample implies side.
Adjacent-numbered pages: BP1237 BP1238 BP1239 BP1240 BP1241  *  BP1243 BP1244 BP1245 BP1246 BP1247
meta (see left/right), links, keyword, right-self, metameta, left-it
linksbp [smaller | same | bigger]
Aaron David Fairbanks