Although such a case is rare, it is by no means unique.
这种情况很罕见，但并非绝无仅有。
Although such a rule might appear to avoid contradictory signals it is not foolproof.
尽管这样的规则能避免产生一些相互矛盾的信号，但不能完全避免。
Although such a rule might appear to avoid contradictory signals it is not foolproof.
尽管这样的规则能避免产生一些相互矛盾的信号，但不能完全避免。
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