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My brain is fried (yay Friday) and I can't seem to find this in the documentation. But how do I specify an upstream task explicitly when using the `with Flow() as flow:` pattern?

Like this?
```with Flow(...) as flow:
    a = task_a()
    b = task_b(upstream_tasks=[a])```

thank you. I was looking for a function/method call

```with Flow(...) as flow:
    a = task_a()
    b = task_b()
    b.set_upstream(a)```

ok, so I can do it either way? Brilliant!