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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 inline(self):
 """Return the declarator as a single line."""

        tp_lines, tp_decl = self.get_decl_pair()
        tp_lines = " ".join(tp_lines)
        if tp_decl is None:
            return tp_lines
        else:
            return "%s %s" % (tp_lines, tp_decl)