Let $A=\left[\begin{array}{lll}1& 1& 1\\ 1& -1& 0\\ 0& 1& -1\end{array}\right]$, $A_1$ be a matrix formed by the cofactors of the elements of the matrix $A$ and $A_2$ be a matrix formed by the cofactors of the elements of matrix $A_1.$ Similarly, if $A_{10}$ be a matrix formed by the cofactors of the elements of matrix $A_9$, then the value of $\left|A_{10}\right|$ is