Equivalently, some permutation of the objects reverses the sequence vs. not.
Palindromes fit left. Strings of distinct objects repeated any number of times fit left.
Adjacent-numbered pages: BP1269 BP1270 BP1271 BP1272 BP1273  *  BP1275 BP1276 BP1277 BP1278 BP1279
nice, precise, allsorted, notso, sequence, miniworlds
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Aaron David Fairbanks