Anonymous Monk,
This could be an interesting math problem if you wanted it to be. The other solutions provided are more practical and if they meet your needs, you can stop reading now.
In essence, you are trying to determine a hidden property of a number (which chapter a sentence is in) by looking at some other property of the number (its ordinal value in all sentences). Are you looking for a way to create a function that given any sentence in the book, determine which chapter it is in by some creative math approach? If so, please respond. If not, probably the most efficient way is to map all sentences to a chapter in the book using a hash (assumes book is static, numerous lookups, and that memory consumption is not prohibitive).
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