Type fix in guide
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@ -218,7 +218,7 @@ list is exhausted.
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You can avoid piling up additions by adding along the way. To
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accumulate a length this way, we need a function that takes both a
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list and the length of the list seem so far; the code below uses a
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list and the length of the list seen so far; the code below uses a
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local function @racket[iter] that accumulates the length in an
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argument @racket[len]:
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