[0b−b0]\left[\begin{array}{cc}0 & \mathbf{b} \\-\mathbf{b} & 0\end{array}\right][0−bb0]
[b00−b]\left[\begin{array}{cc}b & 0 \\0 & -b\end{array}\right][b00−b]
[b0−b0]\left[\begin{array}{cc}\mathrm{b} & 0 \\-\mathrm{b} & 0\end{array}\right][b−b00]
[0−b0 b]\left[\begin{array}{cc}0 & -\mathrm{b} \\0 & \mathrm{~b}\end{array}\right][00−b b]
