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Moreover, if an operator $T$ satisfies subspace-hypercyclic criterion, then so $T\\oplus T$ does. Also, we obtain that under certain conditions, if $T\\oplus T$ is hypercyclic then $T$ satisfies subspace-hypercyclic criterion and, the subspace-hypercyclic operators satisfy subspace-hypercyclic criterion which gives the \"subspace-hypercyclic\" analogue of Theorem 2.3. 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