This is LaTeX code:

[latex]
\left\{ {\left[ {\begin{array}{*{20}c}
 1 & 2 \\
 1 & 1 \\

 \end{array} } \right]} \right\} \cup \left\{ {E_{11} ,E_{12} ,E_{21} ,E_{22} } \right\}
[/latex]