The middle matrix should be
[ 0 0 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 1 0 ] {\displaystyle \left[{\begin{array}{cccc|c}0&0&0&0&0\\0&1&1&0&0\\0&0&1&1&0\\0&0&0&1&0\end{array}}\right]}
Return to errata.
![{\displaystyle \left[{\begin{array}{cccc|c}0&0&0&0&0\\0&1&1&0&0\\0&0&1&1&0\\0&0&0&1&0\end{array}}\right]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7491d2f6fdc10e3e53649765a0e38c1c8c88808a)
