nodes except the root must have a single indegree. e nodes that emerge from the branches of a node are the
children, and the node from which the branches emerge is the parent node. Two or more nodes of the same par-
ent are referred to as siblings. e nodes that appear in the path from the root to a given node are the ancestors
of the given node, and the nodes that appear in all the paths from a given node to a leaf are the descendents of
the node. Level of a node is de ned starting with the root given as Level 1 and the other nodes are given with
higher level numbers based on their association. ...
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