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\documentclass[10pt,a5paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage{xcolor}
\newcounter{sentence}[section]
\renewcommand{\thesentence}{[\thesection,\arabic{sentence}]}
\newcommand{\R}{\mathbb{R}}
\newcommand{\words}{blah bla blha}
\newcommand{\todo}[1]{{\color{red}\large TODO: #1}}
\newcommand{\sent}[1]{\refstepcounter{sentence}#1\textsuperscript{\arabic{sentence}}}
\newcommand{\mymatrix}[4]{\begin{pmatrix}
#1 & #2 \\
#3 & #4
\end{pmatrix}}
\newcommand{\twocases}[4]{\begin{cases}
#1 & #2 \\
#3 & #4
\end{cases}}
\begin{document}
\section{First section}
\sent{A sentence before the first one}
\sent{This is a sentence.}
\label{s1}
\sent{This is another sentence.}
\todo{finish the first section}
This is a longer sentence that takes more than one line line maybe~no still it random words to show that how tilde works i dont know Theorem~10
\section{Second section}
\sent{A sentence in the second section.}
\label{sanother}
\vspace{2cm}
In sentence~\ref{s1}... \todo{what did I want to say?}
\[ \R \]
\words
\[
\mymatrix{x}{a_{2,2}}{0}{f(10)}
\]
\[
f(x)=\twocases{x^2}{\text{if }x>0}{-x^3}{\text{otherwise.}}
\]
\end{document}
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