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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 _calf(self, spec):
 """ The main call, assuming the base spec is prepared. Also, no advices will be triggered. """


        self.prepare(spec)
        self.compile(spec)
        self.assemble(spec)
        self.link(spec)
        self.finalize(spec)