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Typo fix #14

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Typo fix #14

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2 changes: 1 addition & 1 deletion books/designing-data-intensive-applications.md
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Expand Up @@ -225,7 +225,7 @@ If the database itself does not support joins, you have to emulate a join in app

The most popular database for business data processing in the 1970s was the IBM's _Information Management System_ (IMS).

IMS used a _hierarchical model_ and like document databases worked well for one-to-many relationships, but it made many-to-,any relationships difficult, and it didn't support joins.
IMS used a _hierarchical model_ and like document databases worked well for one-to-many relationships, but it made many-to-many relationships difficult, and it didn't support joins.

#### The network model

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