I need to give a huge list of matrices to diagonalise. I read this answer, but I can't figure how to make it work.

Here is my code, in fact, I have many more matrices.

\documentclass{article}
\usepackage{blindtext}
\usepackage{etex,
amsmath,
amsthm,
amsfonts,
amssymb,
latexsym,
mathtools,
etoolbox,
thmtools,
float}
\NewPatternFormat{aa}{\alphalph}
\settasks{counter-format = {tsk[aa]}, label-offset = 5mm}
\begin{document}
Which one of the entries does not fit with the others?
\task     $\begin{bmatrix*}[r]4 & 3\\ 2 & 3 \end{bmatrix*}$
\task     $\begin{bmatrix*}[r]2 & 4\\ 5 & 3 \end{bmatrix*}$
\task     $\begin{bmatrix*}[r] 4 & 1\\ 4 & 4\end{bmatrix*}$
\task     $\begin{bmatrix*}[r]2 & 1\\ 2 & 3 \end{bmatrix*}$
\end{document}


Macro \alphalph is provided by package alphalph:

\documentclass{article}
\usepackage{blindtext}
\usepackage{
etex,
amsmath,
amsthm,
amsfonts,
amssymb,
latexsym,
mathtools,
etoolbox,
thmtools,
float,
}
\NewPatternFormat{aa}{\alphalph}
\settasks{counter-format = {tsk[aa]}, label-offset = 5mm}
\begin{document}
Which one of the entries does not fit with the others?
\task     $\begin{bmatrix*}[r]4 & 3\\ 2 & 3 \end{bmatrix*}$
\task     $\begin{bmatrix*}[r]2 & 4\\ 5 & 3 \end{bmatrix*}$
\task     $\begin{bmatrix*}[r] 4 & 1\\ 4 & 4\end{bmatrix*}$
\task     $\begin{bmatrix*}[r]2 & 1\\ 2 & 3 \end{bmatrix*}$