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We prove here a functional central limit theorem for the random walk with a slow bond: if $\\beta<1$, then it converges to the usual Brownian motion. If $\\beta\\in (1,\\infty]$, then it converges to the reflected Brownian motion. 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We prove here a functional central limit theorem for the random walk with a slow bond: if $\\beta<1$, then it converges to the usual Brownian motion. If $\\beta\\in (1,\\infty]$, then it converges to the reflected Brownian motion. 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