Long description

The image consist of 3 trees. The first tree labeled "hello" index consist of four levels. The first level consist of a single node, which is basically called root node. The first level, branch off to the second level, and forms two new nodes, which are basically called parent node. The second level, branch off to the third level, and forms four new nodes. The nodes in the third level are basically called the child nodes. The third level branches off to the fourth level, and forms eight new nodes. The second tree labeled "world" index and the third tree labeled U R L I D index also has four levels of nodes, with same branching structure as "hello" index tree. An arrow from the root node of "hello" index tree is connected to the root node of U R L I D index tree. An arrow from the level 2 second node of "hello" index tree is connected to the level 3 first node of U R L I D index tree. An arrow from the level 4 eighth node of "hello" index tree is connected to the level 3 third node of U R L I D tree. And an arrow from the level 3 fourth node of "hello" index tree is connected to the level 4 eighth node of U R L I D index tree.