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Specifically, $M^4$ is either an equatorial 4-sphere, a Clifford torus $\\mathbb{S}^2\\left(\\frac{\\sqrt{2}}{2}\\right)\\times \\mathbb{S}^2\\left(\\frac{\\sqrt{2}}{2}\\right)$ or $\\mathbb{S}^1\\left(\\frac{1}{2}\\right)\\times \\mathbb{S}^3\\left(\\frac{\\sqrt{3}}{2}\\right)$, or a Cartan's minimal hypersurface. Consequently, the squared norm of the second fundamental form $S$ can only take the values 0, 4, 12. 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