During 0-1 each task completes its initiate.

During 1-2
   Task 1 completes its request (i.e. the request is granted)
   Task 2 computes (1 of 2)
Three units available at 2.

During 2-3
   task 1 computes (1 of 3)
   task 2 computes (2 of 2)
Three units available at 3.

During 3-4
   task 1 computes (2 of 3)
   task 2's request cannot be granted (not safe).
Three units available at 4

During 4-5
   Banker first checks blocked tasks, but cannot grant 2's request.
   task 1 computes (3 of 3)
Three units available at 5

During 5-6
   Banker first checks blocked tasks, but cannot grant 2's request.
   Task 1 releases 1 unit (available at 6).
Four units available at 6

During 6-7
   Banker first checks blocked tasks and can grant 2's request.
   Task 1 computes (1 of 1) and terminates (at 7).
Three units available at 7.

During 7-8
   Task 2 computes (1 of 1).
Three units available at 8.

During 8-9
   Task 2 releases 1 unit (available at 9) and terminates (at 9).
Four units available at 9.