$A=\left[\begin{array}{rr}10 & 2 & -8 & 9
\\3 & 6 & 1 & -4
\\-2 &1 &9 & 0
\\8 &-3 &-6 & 1
\\-6 &3 &9 & -1\end{array}\right]$
**$A_{3,4}=$** [[☃ math-keypad 1]]
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