Select all pairs of orthogonal vectors.
\(\begin{bmatrix}1\\-3\end{bmatrix}\), \(\begin{bmatrix}-3\\1\end{bmatrix}\) \(\begin{bmatrix}2\\3\end{bmatrix}\), \(\begin{bmatrix}-6\\4\end{bmatrix}\) \(\begin{bmatrix}1\\2\\-1\end{bmatrix}\), \(\begin{bmatrix}4\\-2\\0\end{bmatrix}\) \(\begin{bmatrix}-1\\3\\-2\\5\end{bmatrix}\), \(\begin{bmatrix}2\\1\\-2\\-1\end{bmatrix}\)