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One possible function that can be used to remove sections of a document tree based on a reference list is the filter() function. The filter() function can be used to iterate through the nodes in the document tree and remove nodes that match a certain criterion. In this case, the criterion would be the presence of a reference item in the reference list. The filter() function can also be combined with other functions, such as the find() function, to search for specific nodes in the document tree based on their attributes or content.