[跟風]拿起離你身邊最近的一本書，翻到第56頁，把第五句話貼到河道，不要提到書名。
<In the same manner, from the result in Table 2.7 we have (p↔q)⇔(p→q)⋀(q→p), and this help validate the use of the term biconditional.>