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Hello, is it possible to use multiple different images for tasks in a prefect flow? And with a Kubernetes runner or Dask runner?

Check <https://discourse.prefect.io/t/can-prefect-run-each-task-in-a-different-docker-container/434|this on Discourse>

in order to get flow of flows to work, do i have to use wait_for_flow_a? or can i just create_flow_run and define upstream_tasks as previous create_flow_run?

So an example would be:
```with Flow("Flow_of_flows", storage=STORAGE) as flow:

    child1 = create_flow_run(
        flow_name="flow_child1",
        project_name=PROJECT_NAME,
        run_config=RUNCONFIG,
    )

    child2 = create_flow_run(
        flow_name="flow_child2",
        project_name=PROJECT_NAME,
        upstream_tasks=[child1],
        run_config=RUNCONFIG,
    )```

yes, that works - the wait task is required if you need to start the next flow run only after the first once completed - it is essentially polling for the state of other flow run to determine whether to run downstream tasks or block and not run downstream tasks if e.g. one child flow run failed