list2=[[((2, 2), (5, 5)), (4.0, 4.0)], [((4, 2), (4, 8)), (4.0, 4.0)], [((5, 6), (3, 8)), (4.0, 7.0)], [((4, 2), (4, 8)), (4.0, 7.0)], [((5, 6), (3, 8)), (4.0, 7.0)], [((1, 4), (5, 8)), (4.0, 7.0)], [((4, 2), (4, 8)), (4.0, 7.0)], [((1, 4), (5, 8)), (4.0, 7.0)]]

[((4, 2), (4, 8)), (4.0, 7.0)] ,[((4, 2), (4, 8)), (4.0, 4.0)]

list3=list2
i=range(0,len(list2))
j=range(0,len(list2))
  for i in list2:
      for j in list3:
        if list2[i][0]==list3[j][0] and list2[i][1]!=list3[j][1]:
        list2[i].append(list3[j][1])
        list2.pop(j)