Help with this code

[Joaquin Alzola]

>> elements. For example, if we have a list_a=["a","b","c","d"] and
>> list_b=["a","b"] I want to obtain a new list_c containing elements that
>> match between these lists (a and b here),

>Perhaps this might work:

>>>> list(set(list_a).intersection(set(list_b)))
>['a', 'b']

>>> list_a={"a","b","c","d"}
>>> list_b={"a","b"}
> sorted(list_a & list_b)
['a', 'b']

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