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>>> l = [[['a','b','c'],['d','f','g']],[['h','i','j'],['k','l','m']]]
>>> [i[1] for i in reduce(lambda x, y: x.extend(y) or x, l)]
['b', 'f', 'i', 'l']
>>> import itertools
>>> l = [[['a','b','c'],['d','f','g']],[['h','i','j'],['k','l','m']]]
>>> [i[1] for i in itertools.chain(*l)]
['b', 'f', 'i', 'l']
>>> l = [[['a','b','c'],['d','f','g']],[['h','i','j'],['k','l','m']]]
>>> sum(sum(l,[]),[])[1::3]
['b', 'f', 'i', 'l']
>>>
>>>
>>> l = [[['a','b','c'],['d','f','g']],[['h','i','j'],['k','l','m']]]
>>> l = reduce(lambda x, y: x+y, l)
>>> reduce(lambda x, y: x+y, l)[1::3]
['b', 'f', 'i', 'l']
>>>
mylist = [[['a','b','c'],['d','f','g']],[['h','i','j'],['k','l','m']]];
res = [mylist[i][j][1] for i in range(len(mylist)) for j in range(len(mylist[i]))];
print(res);