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Basing on the calculation of all the pairwise entanglement in the $n$ ($n\leq 6$)-qubit Heisenberg XX open chain with system impurity, we find animportant result: pairwise entanglement can only be transferred throughentangled pair. The non-nearest pairwise entanglement will has the possibilityto exist as long as there has even number qubit in their middle. This pointmeans that we can get longer distance entanglement in solid system.Comment: 4 pages, 5 figure

An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair