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White (\\PRL{69}{3844}{1993}).  We find a massless point at $\\delta _c =0.25 \\pm 0.01$. We also find the edge states in the region $\\delta <\\delta_c$ under the open boundary condition, which disappear in the region $\\delta >\\delta _{c}$. At the massless point, the spin wave velocity $v_s$ is $3.66 \\pm 0.10$ and the central charge $c$ is $1.0\\pm 0.15$. 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