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We try to compute topological stable rank of $B$ ($= \\tsr(B)$) when $A$ has topological stable rank one. We show that $\\tsr(B) \\leq 2$ when $A$ is a tsr boundedly divisible algebra, in particular, $A$ is a C*-minimal tensor product $UHF \\otimes\n D$ with $\\tsr(D) = 1$. 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