Free Images: "bestof:Walsh 8 * Gould's-Morse.svg Walsh matrix of order 8<br> <br> <math> 1 -2 -2 4 -2 4 4 -8 T</math><br> <br> <math> -1 3 3 -9 3 -9 -9 27 T</math><br> Positive"
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