Requesting a step-by-step solution. Not explanation of the steps.

Reduce the following game by dominance property and solve it:

\begin{tabular}{|c|c|c|c|c|c|} \hline & & \multicolumn{4}{|c|}{ Player B } \\ \hline & & B1 & B2 & B3 & B4 \\ \hline \multirow{3}{*}{ Player A } & A1 & 2 & 2 & 4 & 1 \\ \cline { 2 - 6 } & A2 & 6 & 1 & 12 & 3 \\ \cline { 2 - 6 } & A3 & 3 & 2 & 0 & 6 \\ \cline { 2 - 6 } & A4 & 2 & 3 & 7 & 1 \\ \hline \end{tabular}