https://en.wikipedia.org/wiki/Opaque_set
Adjacent-numbered pages: BP1244 BP1245 BP1246 BP1247 BP1248  *  BP1250 BP1251 BP1252 BP1253 BP1254
notso, blackwhite, right-null, perfect, bordercontent
Leo Crabbe
Adjacent-numbered pages: BP1258 BP1259 BP1260 BP1261 BP1262  *  BP1264 BP1265 BP1266 BP1267 BP1268
overriddensolution, left-finite, left-full, right-null, invalid, impossible, funny
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