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Line 16:
Line 16: − *H_2 = \begin{bmatrix}+ − *H_3 =\begin{bmatrix}+
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1 \\
1 \\
\end{bmatrix}
\end{bmatrix}
H_2 = \begin{bmatrix}
1 & 1 \\
1 & 1 \\
1 & -1 \\
1 & -1 \\
\end{bmatrix}
\end{bmatrix}
H_3 =\begin{bmatrix}
1 & 1 & 1 & 1 \\
1 & 1 & 1 & 1 \\
1 & -1 & 1 & -1\\
1 & -1 & 1 & -1\\