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docs(afs): Typo in querying-collections (#1253)
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docs/firestore/querying-collections.md

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@@ -55,7 +55,7 @@ To enable dynamic queries one should lean on RxJS Operators like `switchMap`.
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An RxJS Subject is imported below. A Subject is like an Observable, but can multicast to many Observers. Subjects are like EventEmitters: they maintain a registry of many listeners. See, [What is a Subject](http://reactivex.io/rxjs/manual/overview.html#subject) for more information.
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When we call [`switchMap` on the Subject](https://www.learnrxjs.io/operators/transformation/switchmap.html), we cap map each value to a new Observable; in this case a database query.
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When we call [`switchMap` on the Subject](https://www.learnrxjs.io/operators/transformation/switchmap.html), we can map each value to a new Observable; in this case a database query.
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```ts
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const size$ = new Subject<string>();

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