Create a precedence diagram based on the activities and their predecessors.

\begin{tabular}{|c|c|} \hline Activity & Predecessor \\ \hline A & none \\ \hline B & none \\ \hline C & A, B \\ \hline D & A, C \\ \hline E & D \\ \hline F & E \\ \hline G & F \\ \hline H & F, G \\ \hline \end{tabular}