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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 instructions(self):
 """ Retrieve the instructions for the rule. """


        if self._instructions is None:
            # Compile the rule into an Instructions instance; we do
            # this lazily to amortize the cost of the compilation,
            # then cache that result for efficiency...
            self._instructions = parser.parse_rule(self.name, self.text)

        return self._instructions