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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 get_speaker_muted(self):
 """Return whether or not the speaker is muted."""

        if not self.camera_extended_properties:
            return None

        speaker = self.camera_extended_properties.get('speaker')
        if not speaker:
            return None

        return speaker.get('mute')