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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 instance(self, skip_exist_test=False):
 """ Returns the instance of the related object linked by the field. """

        model = self.database._models[self.related_to]
        meth = model.lazy_connect if skip_exist_test else model
        return meth(self.proxy_get())