天下苦 久矣.
Less than 1 minuteAbout 18 words
\begin{bmatrix}
v_1 & 1 & 1 & 1 & & & & & & & \\
v_2 & -1 & & & 1 & 1 & & & -1 & & \\
v_3 & & & & -1 & & 1 & -1 & & -1 & \\
v_4 & & -1 & & & & -1 & 1 & & & -1 \\
v_5 & & & -1 & & -1 & & & 1 & 1 & 1 \\
\end{bmatrix}