\documentclass[a4paper,12pt]{report}
\input{commands}
\usepackage{index}
\makeindex
\begin{document}
\setlength{\parindent}{0pt}
\setlength{\parskip}{1ex plus 0.5ex minus 0.2ex}
\include{nonpage}
\include{besm}
\include{page3}
\input{jeld_info}
\include{cover_fa}
\pagenumbering{Alph}
\include{sepas}
\include{abstract_fa}
\tableofcontents
\linespread{1.6}
\doublespacing
\setlength{\baselineskip}{1.2\baselineskip}
\include{nemad}
\include{pishgoftar}
\pagenumbering{arabic}
\pagestyle{fancy}
\fancyhf{}
\fancyhead[RO]{\nouppercase\leftmark}
\fancyhead[LE]{ ابرگروه‌های $ n $-تایی فازی}
\fancyhead[LO,RE]{ \thepage}
\include{chap1}
\include{chap2}
\include{chap3}
\include{chap4}
\singlespacing
\include{references}
\baselineskip=.75cm
\include{dic-fa2en}
\include{dic-en2fa}
\printindex
\singlespacing
\newgeometry{top=30mm, bottom=25mm, left=30mm, right=25mm}
\include{abstract_en}
\include{cover_en}
\include{nonpage}
\end{document}