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Thank you very much for help

Hello!

I've got problem with wrong elemnts order in my document. Sample of my code:

\section{Projekt systemu}
\subsection{Przypadki uzycia i scenariusze}

\begin{figure}
\begin{center}
\includegraphics[scale=0.8]{uc1.png}
\end{center}
\caption{Przypadki uzycia}
\end{figure}

\subsection{Diagramy ...