rootchild1child1.1child1.1.1phase1.1.1-1phase1.1.1-2child1.1.2phase1.1.2-1phase1.1.2-2child1.2child1.2.1phase1.2.1-1phase1.2.1-2child1.3child1.3.1phase1.3.1-1phase1.3.1-2child1.3.2phase1.3.2-1phase1.3.2-2child2child2.1child2.1.1phase2.1.1-1phase2.1.1-2child2.1.2phase2.1.2-1phase2.1.2-2child2.2child2.2.1phase2.1.1-1phase2.1.1-2