| 1 | # Sources
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| 2 |
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| 3 | A source is a stream that is not writable.
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| 4 | You *must* have a source at the start of a pipeline
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| 5 | for data to move through.
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| 6 |
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| 7 | in general:
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| 8 |
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| 9 | ``` js
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| 10 | pull(source, through, sink)
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| 11 | ```
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| 12 |
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| 13 | See also:
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| 14 | * [Throughs](../throughs/index.md)
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| 15 | * [Sinks](../sinks/index.md)
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| 16 |
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| 17 | ## [values](./values.md)
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| 18 | ## [keys](./keys.md)
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| 19 | ## [count](./count.md)
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| 20 | ## [infinite](./infinite.md)
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| 21 | ## [empty](./empty.md)
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| 22 | ## [once](./once.md)
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| 23 | ## [error](./error.md)
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