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\begin{document}
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%  Start entering your article !
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\input{Coverpage}
\pagestyle{empty}
\pagenumbering{roman}
\tableofcontents
\pagebreak
\newpage
\pagestyle{plain}
\pagenumbering{arabic}
\input{Tools}  
\newpage
\input{Seasons/Seasons}
\newpage
\input{MoonPhases/MoonPhases} 
\newpage
\input{Kepler/Kepler}
\newpage
\input{Mercury/Mercury}
\newpage
\input{ScaleSS/ScaleSolarSystem}
\newpage
\input{Density/Density}
\input{EarthDensity/EarthDensity}
\newpage
\input{Reflectance/ReflecSpec}
\newpage
\input{Earthquakes/Earthquakes} 
\onecolumn
\newpage
\input{Moon/Moon}
\newpage
\input{Terrestrial/Terrestrial}
\newpage
\input{HeatCool/HeatCool} 
\newpage
%\input{MarsWater} 
\input{WateronMars/WateronMars}
\newpage
\input{Io/Io} 
\newpage
\input{Comet/Comet}
\newpage
\input{Sun/Sun}
\newpage
\input{Exoplanets/Exoplanets}
\newpage
\input{Review} 
\newpage
\input{AppendixA}
\end{document}