Example 9: - Draw the network diagram in the manner of rectangles for the project whose details are listed in the table below, then calculate the early and late beginnings and ends, the free and surplus time for the activities, then determine the critical activities, the critical path and the time of completion of the project

Dependency Activity A B D E F G Duration 8 10 5 15 15 5 3 A A A B,C D, E, F 16