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Fix typo (#29)

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Yadong Wen 2017-03-22 22:53:15 -04:00 committed by Donne Martin
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@ -943,7 +943,7 @@ A key-value store generally allows for O(1) reads and writes and is often backed
Key-value stores provide high performance and are often used for simple data models or for rapidly-changing data, such as an in-memory cache layer. Since they offer only a limited set of operations, complexity is shifted to the application layer if additional operations are needed.
A key-value store is the basis for more complex system systems such as a document store, and in some cases, a graph database.
A key-value store is the basis for more complex systems such as a document store, and in some cases, a graph database.
##### Source(s) and further reading: key-value store