3. Network Diagram with Contingency and Crashed

https://lucid.app/lucidspark/0a502cda-4195-4aa2-98d5-9ac78fde3097/edit?viewport_loc=-4503%2C-1693%2C7619%2C4175%2C0_0&invitationId=inv_7073457f-15e9-4de5-af9e-1c5592ccb021