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I'm trying to get my table the way i want it to be, but I can't get it right.

In attachment you see what i want. the code I have is also added.

Thank you.

\begin{table}[h]
\centering
\begin{tabular}{| p{2cm} || p{3cm} | p{3cm} | p{3cm} |}
\hline
\rowcolor{gray!25} &\textbf{GUMO} & \textbf ...