Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 07:18:10) [MSC v.1900 32 bit (Intel)] on win32
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>>> l = [0,1,2,3,4,5,6,7,8,9]
>>> print(l[::4])
[0, 4, 8]
>>> print(l[4::4])
[4, 8]
>>> print(l[3::4])
[3, 7]
>>> 
