\ \begin{center} \begin{tabular}{ c | c c} & B & b \ \hline A & $(1+s_A)(1+s_B) $&$ (1+s_{A}) (1-s_{B}) $\ a & $(1- s_{A})(1+ s_{B})$&$ (1-s_A)(1-s_B) $ \end{tabular} \end{center} \
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