'Celery having a group at the end of the chain

I am trying to create a canvas celery chain with three tasks, where the first two are supposed to run synchronously after each other and the third one is a group of two paralell tasks that can also run asynchronously. My tasks have booleans as return values and I dont need to use that as an argument in the new tasks. Can someone show me an example how to link the tasks together ?

Help is appreciated



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