\usepackage {graphics}
\[
\begin{array}{ccccc}
a_{11} \\
a_{21} & a_{22} \\
a_{31} & a_{32} &
a_{33}\Bpara{0}{7}{61}{65} \\
a_{41} & a_{42} &
a_{43} & a_{44} \\
a_{51} & a_{52} &
a_{53}\Bpara{-8}{-6}{-90}{58}
& a_{54} & a_{55}
\end{array}
\]
Generated by dwww version 1.15 on Sat May 18 06:47:26 CEST 2024.