[Python] Intersection of two lists including duplicates?

>>> a = [1,1,1,2,3,4,4]
>>> b = [1,1,2,3,3,3,4]

[1,1,2,3,4]


Please note this is not the same question as this: Python intersection of two lists keeping duplicates Because even though there are three 1s in list a, there are only two in list b so the result should only have two.

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