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\NC A_n \VL B_n \NR
\stopmymatrix
\stopformula
</context>
= Border matrices with {{cmd|\startbbordermatrix}} ==
<context source="yes">
\startformula
\startbbordermatrix
\NC \NC col 1 \NC cold 2 \NC col 3 \NR
\NC row 1 \NC a_{11} \NC a_{12} \NC a_{13} \NR
\NC row 2 \NC a_{21} \NC a_{22} \NC a_{23} \NR
\NC row 3 \NC a_{31} \NC a_{32} \NC a_{33} \NR
\stopbbordermatrix
\stopformula
</context>
