human
Solve the following python programming problem given the following code:
def missing(self) : 
    installed = [item.split () [0].strip () for item in self.installed ()] 
    brewed = self.brew.ls () 
    def brew_orphan(formula) : 
        if formula.startswith ('pip-') : 
            return False 
uses = self.brew.uses (formula) 
        return (len ((set (installed) & set (uses))) == 0) 
return sorted (filter (installed, (set (brewed) - set (installed)))) 

    
    

    Fix the buggy line: return sorted (filter (installed, (set (brewed) - set (installed))))
assistant
#Here is Python code to fix the buggy line: return sorted (filter (installed, (set (brewed) - set (installed))))
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return sorted (filter (def brew_orphan(, (set (brewed) - set (installed))))