<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_subvisual(self, visual):
 """Remove a subvisual Parameters visual : instance of Visual The visual to remove. """

        visual.events.update.disconnect(self._subv_update)
        self._subvisuals.remove(visual)
        self.update()