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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 RootNode(self):
 """Return our current root node and appropriate adapter for it"""

        tree = self.loader.get_root( self.viewType )
        adapter = self.loader.get_adapter( self.viewType )
        rows = self.loader.get_rows( self.viewType )
        
        adapter.SetPercentage(self.percentageView, adapter.value( tree ))
        
        return adapter, tree, rows