code: def add(self, aList):
          '''
          API:
              add(self, aList)
          Description:
              Adds items in the list to the set.
          Input:
              aList: List of items.
          Post:
              self.sizes will be updated.
          '''
          self.add_node(aList[0])
          for i in range(1, len(aList)):
              self.add_edge(aList[i], aList[0])
          self.sizes[aList[0]] = len(aListf add(self, aList):
          '''
          API:
              add(self, aList)
          Description:
              Adds items in the list to the set.
          Input:
              aList: List of items.
          Post:
              self.sizes will be updated.
          '''
          self.add_node(aList[0])
          for i in range(1, len(aList)):
              self.add_edge(aList[i], aList[0])
          self.sizes[aList[0]] = len(aList)
docs: API:
              add(self, aList)
          Description:
              Adds items in the list to the set.
          Input:
              aList: List of items.
          Post:
              self.sizes will be updated.