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1 \\
1 \\
\end{bmatrix}</math>
\end{bmatrix}</math>
<math>H_2 = \begin{bmatrix}
*<math>H_2 = \begin{bmatrix}
1 & 1 \\
1 & 1 \\
1 & -1 \\
1 & -1 \\
\end{bmatrix}</math>
\end{bmatrix}</math>
<math>H_3 =\begin{bmatrix}
*<math>H_3 =\begin{bmatrix}
1 & 1 & 1 & 1 \\
1 & 1 & 1 & 1 \\
1 & -1 & 1 & -1\\
1 & -1 & 1 & -1\\