human
Solve the following python programming problem given the following code:
def _tests_by_properties(self, tests_to_targets, * properties) : 
    def combined_property(target) : 
        return tuple ((prop (target) for prop in properties)) 
return self._tests_by_property (self, combined_property) 

    
    

    Fix the buggy line: return self._tests_by_property (self, combined_property)
assistant
#Here is Python program to fix the buggy line: return self.

return self._tests_by_property (tests_to_targets, combined_property)