3 ms·

Does the library contain duplicates? Otherwise an 800 page book that is just the same 400 page book concatenated to itself would not be found.

• gwern 2y ago
  Who said you can't just stipulate having the same book twice or use self-reference?
  • dhaugshs 2y ago
    [dead]
• mr_toad 2y ago
  Half the library would just be the other half written backwards.