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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 installedOn(self):
 """ If this item is installed on another item, return the install target. Otherwise return None. """

    try:
        return self.store.findUnique(_DependencyConnector,
                                     _DependencyConnector.installee == self
                                     ).target
    except ItemNotFound:
        return None