Please help. This is a CPM question.

Question: You notice in fact that task A can be split into two tasks, set up the stage (task A1) and decorate the stage (task A2), each of which takes 2 hours. Also, the crew can fix the stage lighting (task D) while the stage is being decorated. However, the stage must be set up before it is decorated, and before the stage lighting is fixed. Draw a revised network for the project, and identify the critical path. What does this tell you about the effect of aggregation of tasks on timing of a project?

Thank you so much!

TASK DESCRIPTION IMMEDIATE PREDECESSORS TASK TIME (in hours) A B D E F G H Set up and decorate the set Check the script Apply makeup Fix the stage lighting Put on costumes Dress rehearsal Check audio/video equipment Shoot the scene A A, B, E D F, G 4 3 2 2 3 3 2 2 + mamma