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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 allowed_target_sdp_states(self):
 """Return a list of allowed target states for the current state."""

        _current_state = self._sdp_state.current_state
        _allowed_target_states = self._sdp_state.allowed_target_states[
            _current_state]
        return json.dumps(dict(allowed_target_sdp_states=
                               _allowed_target_states))