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Let be the set of all primes. A subgroup of a group is called {\it -subnormal} in , if either , or there exists a chain of subgroups $H=H_0\le H_1\le \ldots \le H_n=G, \ |H_{i}:H_{i-1}|\in \Bbb P, \ \forall i.GG\mathbb PGG=AB\mathbb PAB$ is studied. The structure of its -supersoluble residual is obtained. In particular, it coincides with the nilpotent residual of the -residual of . Here is the formation of all groups with abelian Sylow subgroups. Besides, we obtain new sufficient conditions for the -supersolubility of such group .

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