对给出的一个代数系统〈G，*〉，其中G={1，2，…,n}，*运算由运算表矩阵给出，要判断：
〈G，*〉是否为半群；
〈G，*〉是否含有幺元；
-Pairs of a given algebra system , where G = (1,2, ..., n),* operator matrix is given by the operation table, it is necessary to determine
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