Compute the following product.

$\left[\begin{array}{ccc} -6 &0 &0\cr 1 &-6 &0\cr 5 &9 &1 \end{array}\right] \left[\begin{array}{ccc} -5 &0 &0\cr 4 &-2 &0\cr 2 &-2 &4 \end{array}\right] =$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$