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the set of the left child without elements from the right child

This is used for something like "poliovirus NOT polio"

src/e/u/eutils-HEAD/EUtils/parse.py   eutils(Download)
                elif s == "NOT":
                    try:                        
                        stack[-2:] = [Datatypes.Not(stack[-2], stack[-1])]
                    except Exception, e:
                        print e