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In this paper, for the mapping $\\widetilde{f}: N\\to \\mathbb{R}^{n+1}$ defined by $$ \\widetilde{f}(x)=f(x)-\\frac{||f(x)-P||^2}{2(f(x)-P) \\cdot \\nu(x)}\\nu(x), $$ the following four are shown. (1) $\\widetilde{f}$ is a frontal with its Gauss mapping $\\widetilde{\\nu}(x)=\\frac{f(x)-P}{||f(x)-P||}$ at $\\widetilde{f}(x)$. (2) $\\widetilde{f}$ is the unique anti-orthotomic of $f$ relative to $P$. 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