Update

snippets/latex-mode/bmatrix (3 x 3)

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+# key: mat3
+# name: bmatrix (3 x 3)
+# --
+\\begin{bmatrix}
+${1:A} & ${2:$1} & ${3:$1} \\\\
+${4:$1} & ${5:$1} & ${6:$1} \\\\
+${7:$1} & ${8:$1} & ${9:$1} 
+\\end{bmatrix}