\documentclass{article}

% good old times
\usepackage{vaucanson-g}

\begin{document}
salam
\\
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\begin{figure}[!h]
\begin{VCPicture}{(3,0)(3,0)}
% and then we create the states
\State[x]{(3,2)}{STATEA}
\State[s]{(0,0)}{STATEB}
\State[y]{(3,-2)}{STATEC}
\State[t]{(6,0)}{STATED}
% straight lines
\EdgeR[0.3]{STATEC}{STATED}{$c=4 $}
\EdgeR[0.7]{STATEC}{STATED}{$a=1 $}
\EdgeL[0.3]{STATEB}{STATEA}{$c=5$}
\EdgeL[0.7]{STATEB}{STATEA}{$a=2$}
\EdgeR[0.3]{STATEB}{STATEC}{$c=2$}
\EdgeR[0.7]{STATEB}{STATEC}{$a=5$}
\EdgeL[0.3]{STATEA}{STATED}{$c=2$}
\EdgeL[0.7]{STATEA}{STATED}{$a=7$}
\EdgeL[0.3]{STATEA}{STATEC}{$c=1$}
\EdgeL[0.7]{STATEA}{STATEC}{$a=3$}
\end{VCPicture}
\end{figure}
$dfgf$
$fgdg$
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\end{document}