[tag=□] □ □
[tag=RB] □ □
[tag=VB] □ □
However , nodes must still track the existence of other nodes in the network that might serve as their parent . For these reasons , it is not appropriate to " hard code " the routing topology into the application : rather , nodes should dynamically discover potential parent node candidates and adjust the routing topology as needed . Conversely , nodes could also contact their parent nodes to tell them about their coverage region .