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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 create_calcs(self):
 """Generate a Calc object for each requested parameter combination."""

        specs = self._combine_core_aux_specs()
        for spec in specs:
            spec['dtype_out_time'] = _prune_invalid_time_reductions(spec)
        return [Calc(**sp) for sp in specs]