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Let $G$ be a finite group. Based on the prime graph of $G$,the order of $G$ can be divided into a product of co-prime positive integers.These integers are called order components of $G$ and the set of order components is denoted by $OC(G)$. Some non-abelian simple groups are known to be uniquely determined by their order components. In this paper we discuss the recognizability of simple $K_{n}$-groups$(n = 3, 4)$ by their order components.
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