fix typo in ex2_2.md
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@ -152,7 +152,7 @@ The key feature that makes this work is that a defaultdict
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automatically initializes elements for you--allowing an insertion of a
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new element and an `append()` operation to be combined together.
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## (c) Data Analysis Challenge
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## (d) Data Analysis Challenge
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In the last exercise you just wrote some code to read CSV-data related
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to the Chicago Transit Authority. For example, you can grab the data
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