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\mathbb{N}
\mathbb{P}
\mathbb{N},\mathbb{Z},\mathbb{Q},\mathbb{R},\mathbb{C}
\begin{tabular}{|ccc|}
  \raisebox{1em}{A} & \shortstack{B1 \\ B2 \\ B3} & \raisebox{1em}{C}
\end{tabular}
a=E(XY)