\begin{table}%t4
%\centering
\par
\caption{\label{tab:transition}Labels of transitions.}
\begin{tabular}{ccc|ccc}
\hline\hline
Level & First & Last & Level & First & Last \\\hline
 2 & 1 & 1 & 12 &56 & 66 \\
 3 & 2 & 3 & 13 &67 & 78 \\
 4 & 4&  6& 14 &79 & 91 \\
 5 & 7& 10& 15 &92 & 105 \\
 6 & 11& 15 & 16 &106 & 120 \\
 7 & 16 &21 & 17  & 121 & 136 \\
 8 & 22 & 28& 18 & 137  & 153 \\
 9 & 29 & 36 & 19 & 154 & 171\\
 10 &37 & 45& 20 & 172 & 190\\
 11 &46 & 55 &  & &  \\
\hline
\end{tabular}\vspace*{-1.5mm}
\end{table}