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Inverse Function Calculation 1

Suppose that $ f $ is a function and $ f^{-1} $ is the inverse of $ f $. If $ f(1)=2 $, $ f(2) = 6 $, and $ f(3)=5 $, then what is $ f^{-1}(f^{-1}(6)) $?

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$\frac{a}{b}$
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0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$