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$f(x)=\frac{P(x)}{Q(x)}$
$\frac{1+\frac{a}{b}}{1+\frac{1}{1+\frac{1}{a}}}$
$\sum_{\substack{0\le i\le m\\ 0\lt j\lt n}} P(i,j)$
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${\color{Chocolate} Chocolate }$
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${\color{Cyan} Cyan}$
${\color{DarkBlue} DarkBlue}$
${\color{DarkSlateGray } DarkSlate }$
${\color{DeepPink} DeepPink }$
${\color{Emerald} Emerald}$
${\color{Fuchsia} Fuchsia}$
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${\color{Gray} Gray}$
${\color{Green} Green}$
${\color{IndianRed} IndianRed }$
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${\color{LightCoral} LightCoral}$
${\color{Lime} Lime}$
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${\color{Navy} Navy}$
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${\color{RoyalBlue} RoyalBlue}$
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${\color{Silver} Silver}$
${\color{Tan} Tan}$
${\color{Teal} Teal}$
${\color{White} White}$
${\color{Yellow} Yellow}$
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