Create a construction network with the following conditions, specify the critical path, and Find the number of days requ

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Create a construction network with the following conditions,
specify the critical path, and
Find the number of days required. (Indicate the first and
intermediate stages)
① Work activities A, B, and C are executed in parallel as the first
work of this construction.
② Tasks D and E are started only when task A is completed.
③ Task G is started only when tasks B, C, and E are
completed.
④ Task F is started only when tasks A and E are completed.
⑤ Task H is started only when tasks D, E, F, and G are
completed.
⑥ Task I is started only when tasks F and G are completed.
⑦ Tasks H and I are performed in parallel, and when they are
completed, the construction is finished.
⑧ The number of days required for each task is as follows.
A = 5 days, B = 10 days, C = 9 days, D = 20 days, E = 7 days,
F = 15 days, G = 16 days, H = 8 days, I = 5 days