The *SplitMerge* sample demonstrates a `parallel split`_ followed by a `simple merge`_ workflow pattern. It spawns a
number of worker activities which are then merged using ``wait_for_all``.

.. _`parallel split`: http://docs.aws.amazon.com/amazonswf/latest/awsrbflowguide/programming-workflow-patterns.html#programming-workflow-patterns-synchronization
.. _`simple merge`: http://docs.aws.amazon.com/amazonswf/latest/awsrbflowguide/programming-workflow-patterns.html#programming-workflow-patterns-simple-merge