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S├ębastien Portebois (6) [Avatar] Offline
#1
In the introduction paragraphs (before 19.1), there's a duplicate "are":

Maps are especially useful for unstructured data where the keys are are determined while a program is running.
(note the duplicate are)
Nathan Youngman (56) [Avatar] Offline
#2
Thanks for pointing that out. I'll get it corrected.