Xipeng Qiu
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Xipeng Qiu
Missing or unrecognized delimiter for \left . For example, $$ \phi_2(x,y)=\left\{ \begin{array}{11} 1 & \textrm{if x contains 'stock' and y is 'sport'}\\ 0 & \textrm{otherwise} \end{array} \right.. $$