Long description

There are three tiers of image. The first tier labeled Main procedure has one node. The second tier labeled Service procedure has six nodes connected to the first node of the first tier. The third tier labeled Utility procedures has five nodes. The first two nodes of the third tier are connected to the first node of the second tier. The first node of the third tier is connected to the second node of the second tier. The second node of the third tier is connected to the fifth node of the second tier. The third node of the third tier is connected to the fourth and sixth node of the second tier. The fourth node of the third tier is connected to the second node of the second tier. The fifth node of the third tier is connected to the sixth node of the second tier.