\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
The table below shows the possible outcomes when selecting two letters at random from the word "NODE" without replacement (after choosing a letter, it is not put back before the next selection). An "X" means no outcome is possible.
\(\begin{aligned} & \textcolor{colorprop}{\text{letter 2}} \\ \textcolor{colordef}{\text{letter 1}} \end{aligned} \) \(\textcolor{colorprop}{N}\) \(\textcolor{colorprop}{O}\) \(\textcolor{colorprop}{D}\) \(\textcolor{colorprop}{E}\)
\(\textcolor{colordef}{N}\) X ? \(\textcolor{colordef}{N}\textcolor{colorprop}{D}\) \(\textcolor{colordef}{N}\textcolor{colorprop}{E}\)
\(\textcolor{colordef}{O}\) \(\textcolor{colordef}{O}\textcolor{colorprop}{N}\) X \(\textcolor{colordef}{O}\textcolor{colorprop}{D}\) \(\textcolor{colordef}{O}\textcolor{colorprop}{E}\)
\(\textcolor{colordef}{D}\) \(\textcolor{colordef}{D}\textcolor{colorprop}{N}\) \(\textcolor{colordef}{D}\textcolor{colorprop}{O}\) X \(\textcolor{colordef}{D}\textcolor{colorprop}{E}\)
\(\textcolor{colordef}{E}\) \(\textcolor{colordef}{E}\textcolor{colorprop}{N}\) \(\textcolor{colordef}{E}\textcolor{colorprop}{O}\) \(\textcolor{colordef}{E}\textcolor{colorprop}{D}\) X
Find the missing outcome.