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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def all_combinations_for_elements(self, element_symbols):
 """ Return a list with all the the possible combination of pseudos for the given list of element_symbols. Each item is a list of pseudopotential objects. Example:: table.all_combinations_for_elements(["Li", "F"]) """

        d = OrderedDict()
        for symbol in element_symbols:
            d[symbol] = self.select_symbols(symbol, ret_list=True)

        from itertools import product
        return list(product(*d.values()))