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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 update(self, app_model, forbidden_keys=None, inverse=False):
 """ Updates the raw model. Consult `zsl.utils.model_helper.update_model`. """

        if forbidden_keys is None:
            forbidden_keys = []

        update_model(self, app_model, forbidden_keys, inverse)