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→Border matrices with {{cmd|startbbordermatrix}}
<context source="yes">
\startformula
\startmatrix[left={\left([},right={\right)]}]
\TT {\bi col 1} \TT {\bi col 2} \TT {\bi col 3}\NR
\NC a_{11} \NC a_{12} \NC a_{13} \NR
\stopmatrix
\stopformula
</context>
