In the $4\times 4$ array shown, each cell of the first three columns has either a cross (X) or a number as per the rule:
\includegraphics[width=0.5\linewidth]{2.png}
A number equals the count of crosses in its $8$ neighboring cells (left, right, top, bottom, and diagonals). The fourth column is empty. As per this rule, the \emph{maximum} number of crosses possible in the empty column is