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On Jul 6, 2018, at 6:35 AM, Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> wrote:

>>   x = []
> 
> x = [[1]] is already a string, not a nested tuple. Requiring x = [ [x]
> ] seems weird.
> 

In the statement x = [[]], the outer tuple is not empty. Therefore I do not think this presents a conflict.