问题2： 要发现收到的报文中的错误。最 “straight forward的方法是什么？ Example 1.One possible coding scheme would be to send a message several times and to compare the received copies with one another.Suppose that the message to be encoded is a binary n-tuple (1,x2,...,n).The message is encoded into a binary 3n-tuple by simply repeating the message three times: (x1,2,.,cn)→(1，c2,.,xn,x1,x2,.,En,1,c2,..,xn)