human
Solve the following python programming problem given the following code:
@ classmethod 
def strategy_for(cls, **kw) : 
    def decorate(dec_cls) : 
        if ('_strategy_keys' not in dec_cls.__dict__) : 
            dec_cls._strategy_keys = [] 
key = tuple (sorted (kw.items ())) 
        cls._all_strategies [cls] [key] = dec_cls 
        dec_cls._strategy_keys.append (key) 
        return dec_cls 
return cls 

    
    

    Fix the buggy line: return cls
assistant
#Here is Python program to fix the buggy line: return cls
.

return def decorate(