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The modular group $\\Gamma=\\operatorname{PSL}_2(\\mathbb{Z})$ acts on $\\mathbf{HP}$ with quotient the modular orbifold $\\mathbf{M}=\\Gamma\\backslash \\mathbf{HP}$. 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The modular group $\\Gamma=\\operatorname{PSL}_2(\\mathbb{Z})$ acts on $\\mathbf{HP}$ with quotient the modular orbifold $\\mathbf{M}=\\Gamma\\backslash \\mathbf{HP}$. 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