Update

snippets/latex-mode/column vector

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+# -*- mode: snippet -*-
+# name: column vector
+# key: cvec
+# condition: 'auto
+# group: math
+# --
+\\begin{pmatrix} ${1:x}_{${2:1}}\\\\ ${3:\\vdots}\\\\ $1_{${4:n}} \\end{pmatrix}