(1 point)
Let $a_1 = \begin{bmatrix} -22 \\ h \\ -5 \end{bmatrix}$, $a_2 = \begin{bmatrix} 21 \\ -21 \\ 5 \end{bmatrix}$, and $a_3 = \begin{bmatrix} -20 \\ 20 \\ -5 \end{bmatrix}$.
The set $\{a_1, a_2, a_3\}$ will span $\mathbb{R}^3$ unless $h = \text{_____}$.
(If there are no values of $h$ that make the set fail to span, enter "NONE". If the set fails to span for all values of $h$ enter "ALL".)