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FlatMapElements
---------------

The Beam SDKs provide language-specific ways to simplify how you provide your DoFn implementation.

FlatMap can be used to simplify DoFn that maps an element to multiple elements (one to many).

**Kata:** Implement a function that maps each input sentence into words tokenized by
whitespace (" ") using
[FlatMap](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.core.html#apache_beam.transforms.core.FlatMap).

<div class="hint">
  Use <a href="https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.core.html#apache_beam.transforms.core.FlatMap">
  FlatMap</a> with a lambda.
</div>

<div class="hint">
  Refer to the Beam Programming Guide
  <a href="https://beam.apache.org/documentation/programming-guide/#lightweight-dofns">
  "Lightweight DoFns and other abstractions"</a> section for more information.
</div>
