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# Throughs
A Through is a stream that both reads and is read by
another stream.
Through streams are optional.
Put through streams in-between [sources](../sources/index.md) and [sinks](../sinks/index.md),
like this:
```js
pull(source, through, sink)
```
Also, if you don't have the source/sink yet,
you can pipe multiple through streams together
to get one through stream!
```js
var throughABC = function () {
return pull(
throughA(),
throughB(),
throughC()
)
}
```
Which can then be treated like a normal through stream!
```js
pull(source(), throughABC(), sink())
```
See also:
* [Sources](../sources/index.md)
* [Sinks](../sinks/index.md)
## [map](./map.md)
## [asyncMap](./async-map.md)
## [filter](./filter.md)
## [filterNot](./filter-not.md)
## [unique](./unique.md)
## [nonUnique](./non-unique.md)
## [take](./take.md)
## [flatten](./flatten.md)
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