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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_getitemtypes(self) -> None: """Get the types of all current exchange items supposed to return the values of |Parameter| or |Sequence| objects or the time series of |IOSequence| objects."""

        for item in state.getitems:
            type_ = self._get_itemtype(item)
            for name, _ in item.yield_name2value():
                self._outputs[name] = type_