The oddities of the bigram "ed" pt. 2: Same as it ever was.

[oshfdk]

In a work of fiction this can easily happen if a new character is introduced with a very peculiar foreign sounding name. For example, the below chart shows the number of times "ka" appears in Winnie the Pooh. The first match near the beginning is the chapter index, then there is nothing for half of the book until Roo's mom shows up. But this can happen in non-fiction too, say a history book that doesn't talk about Xerxes until the relevant part of the history is discussed.