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\begin{document}
\begin{tabular}{ccccc}
\hline 
$J^P$ & \multicolumn{2}{c}{Allowed decay mode}\\ 
& \phantom{kk} $ B\xspace\xspace\pi$ \phantom{kk} & \phantom{kk} $B^* \pi$ \phantom{kk} \\
\hline
$0^+$ & yes & no \\
$0^-, 1^+, 2^-, ...$ & no & yes \\
$1^-, 2^+, 3^-, ...$ & yes & yes \\
\hline 
\end{tabular}
\end{document}
