Vertical bar in matrix

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    The attached pdf shows a vertical bar in a matrix and the word file shows how I have brailled it. This example comes from an Algebra 2 book that has several of these pages throughout the book with matrix with vertical bar.

    Do I use the enlarge grouping sign (vertical bar) and space it as though it is a sign of comparison (mathematically, the bar replaces the equal sign)?

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    Someone more expert than I suggested the following:

    456 is used as the vertical line in square roots, division problems and stem-and-leaf plots. Using it as the line in the matrices would be clear. It would be listed on SS page.

    Another alternative is to spur the line, but that would require tactile pages.

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