text: def merge_lists(list1, list2):
  
      list1_index = 0
      while len(list2) != 0:
          if list1_index >= len(list1) or list1[list1_index] > list2[0]:
              list1.insert(list1_index, list2.pop(0))
  
          list1_index += 1
  
      return list1
  
  
  test_list1 = [1, 5, 8, 12, 14, 19]
  test_list2 = [3, 4, 6, 10, 11, 15]
  
  print merge_lists(test_list1, test_list2)
  