Question: Rearranging rows in matrix

Hi, may I know how do i arrange rows on matrixes manually please?

For example, I have a 18x18 matrix. And for my new matrix, I would like to rearrange the whole row. For example the current rows are numbered 1, 2, 3, 4, .... 18. I would like a new matrix where rows are arranged as 4, 6, 8, 14, 2, 3...

Please advice. Thanks.

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