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，更多细节参见使用 WeChat 網頁版
В школьном туалете нашли трехметрового питона14:50
这款产品为何这么赚钱呢？说到底还是因为门槛高。
Another nice context to think about this is in prolog. It is often the case that we can write a n-ary relation and then write a (n+1)-ary version that contains a tracing parameter. This tracing parameter is a proof object / witness.