\documentclass[a4paper]{article}

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%\usepackage[square]{natbib}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}

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\begin{document}
\pagenumbering{gobble}

\Large
 \begin{center}
% Insert the title of your abstract below
The title of your presentation
\\ 


\end{center}

\begin{flushleft}
% Author names
\large
Presenting Author$^1$, Second CoAuthor$^2$, Third CoAuthor$^{1,2}$ \\
\end{flushleft}

\small

\begin{flushleft}
% Affiliations, appropriately matched b
$^1$ Institute name, City, State, (country if not Australia)\\
$^2$ Institute name, City, State

\end{flushleft}


\normalsize
% Abstract body

Please tell us briefly what it is you are going to talk about in a not-too-technical way.

This is a simple one-page abstract template. Please keep your abstract body to within 300 words. Abstract title, authors, affiliations, and references are not included in this limit, although the whole abstract should fit within one page.

The submitting author is responsible for the spelling and grammar of their abstract submission.

Please submit your abstract as both a compiled PDF and LaTeX source document. 

\end{document}