Free Images: "bestof:Walsh 16 * Gould's-Morse.svg Walsh matrix of order 16<br> <br> <math> 1 -2 -2 4 -2 4 4 -8 -2 4 4 -8 4 -8 -8 16 T</math><br> <br> <math> 1 -3 -3 9 -3 9 9 -27 -3"
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