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The suite could read a cataloguing block and could ask a register, and nothing showed the two together — which is the only way either is worth acting on. A title page alone gives up a running head when the scan starts late; an ISBN alone returns a confidently wrong book when the catalogue has been carrying the wrong one for years. The example's title comparison folds to letters and digits rather than comparing strings. A register and a title page differ over case, over a curly apostrophe against a straight one, and over whether the subtitle counts as part of the title. An example that called those disagreements would teach the wrong lesson, and did until it was fixed. It runs on this library and finds both of the cases worth finding: a file called Document5 by -ducati996 that both sources agree is Russell's Problems of Philosophy, and a Pelikan whose stored ISBN belongs to a book about sculpture.