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Let $3\\leq m\\leq n$. We study typical ranks of $m\\times n\\times (m-1)n$ tensors over the real number field. Let $\\rho$ be the Hurwitz-Radon function defined as $\\rho(n)=2^b+8c$ for nonnegative integers $a,b,c$ such that $n=(2a+1)2^{b+4c}$ and $0\\leq b<4$. If $m \\leq \\rho(n)$, then the set of $m\\times n\\times (m-1)n$ tensors has two typical ranks $(m-1)n,(m-1)n+1$. 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