Study the activity list and its network diagram. Calculate the early start, early finish, late start and late finish of activities

\begin{tabular}{|c|c|c|} \hline & & \\ Activity & Duration (days) & Predecessor \\ \hline A & 1 & - \\ \hline B & 2 & A \\ \hline C & 2 & B \\ \hline D & 2 & A \\ \hline E & 3 & D \\ \hline F & 4 & B \\ \hline G & 5 & B \\ \hline H & 6 & G \\ \hline I & 6 & C \\ \hline J & 8 & G \\ \hline K & 5 & E,F \\ \hline L & 6 & I, J \\ \hline \end{tabular}