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<html>
<h2>Flatten</h2>
<p>Flatten is a Beam transform for PCollection objects that store the same data type.
Flatten merges multiple PCollection objects into a single logical PCollection.</p>
<p>In this task, we are going to implement a
<a href="https://beam.apache.org/releases/pydoc/2.11.0/apache_beam.transforms.core.html#apache_beam.transforms.core.Flatten">
Flatten</a> transform that merges two PCollection of words into a single PCollection.
</p>
<br>
<br>
<div class="hint">
Refer to <a href="https://beam.apache.org/releases/pydoc/2.11.0/apache_beam.transforms.core.html#apache_beam.transforms.core.Flatten">Flatten</a>
to solve this problem.
</div>
</html>