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def flatten(input_list):
output_list = []
while True:
if input_list == []:
break
for index, i in enumerate(input_list):
if type(i)== list:
input_list = i + input_list[index+1:]
break
else:
output_list.append(i)
input_list.pop(index)
break
return output_list
>>> ls = [[1,2,3],4,[5,6,[7,8,9,[10,11,12,13]]],[14,15,16]]
>>> ls
[[1, 2, 3], 4, [5, 6, [7, 8, 9, [10, 11, 12, 13]]], [14, 15, 16]]
>>> flatten(ls)
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]