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Most problems are not embarrassingly parallel.

(Fun fact: I once had someone call HR on me because they didn't know embarrassingly parallel was a technical term, and they thought I was belittling them)



Prefix scan is not embarrassingly parallel. Yet OP's statement still works when you change it to scanl (+) 0 [0 1 2 3]


That requires + to be associative. And scan is one of the core skeletons of parallel skeletons, so obviously if you express everything as parallel skeletons, parallel programming remains manageable.




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